lo/tuples_test.go

package lo

import (
	"errors"
	"strconv"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestT(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	r1 := T2("a", 1)
	r2 := T3[string, int, float32]("b", 2, 3.0)
	r3 := T4[string, int, float32]("c", 3, 4.0, true)
	r4 := T5[string, int, float32]("d", 4, 5.0, false, "e")
	r5 := T6[string, int, float32]("f", 5, 6.0, true, "g", 7)
	r6 := T7[string, int, float32]("h", 6, 7.0, false, "i", 8, 9.0)
	r7 := T8[string, int, float32]("j", 7, 8.0, true, "k", 9, 10.0, false)
	r8 := T9[string, int, float32]("l", 8, 9.0, false, "m", 10, 11.0, true, "n")

	is.Equal(Tuple2[string, int]{A: "a", B: 1}, r1)
	is.Equal(Tuple3[string, int, float32]{A: "b", B: 2, C: 3.0}, r2)
	is.Equal(Tuple4[string, int, float32, bool]{A: "c", B: 3, C: 4.0, D: true}, r3)
	is.Equal(Tuple5[string, int, float32, bool, string]{A: "d", B: 4, C: 5.0, D: false, E: "e"}, r4)
	is.Equal(Tuple6[string, int, float32, bool, string, int]{A: "f", B: 5, C: 6.0, D: true, E: "g", F: 7}, r5)
	is.Equal(Tuple7[string, int, float32, bool, string, int, float64]{A: "h", B: 6, C: 7.0, D: false, E: "i", F: 8, G: 9.0}, r6)
	is.Equal(Tuple8[string, int, float32, bool, string, int, float64, bool]{A: "j", B: 7, C: 8.0, D: true, E: "k", F: 9, G: 10.0, H: false}, r7)
	is.Equal(Tuple9[string, int, float32, bool, string, int, float64, bool, string]{A: "l", B: 8, C: 9.0, D: false, E: "m", F: 10, G: 11.0, H: true, I: "n"}, r8)
}

func TestUnpack(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	{
		tuple := Tuple2[string, int]{"a", 1}

		r1, r2 := Unpack2(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)

		r1, r2 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
	}

	{
		tuple := Tuple3[string, int, float64]{"a", 1, 1.0}

		r1, r2, r3 := Unpack3(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)

		r1, r2, r3 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
	}

	{
		tuple := Tuple4[string, int, float64, bool]{"a", 1, 1.0, true}

		r1, r2, r3, r4 := Unpack4(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)

		r1, r2, r3, r4 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
	}

	{
		tuple := Tuple5[string, int, float64, bool, string]{"a", 1, 1.0, true, "b"}

		r1, r2, r3, r4, r5 := Unpack5(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)

		r1, r2, r3, r4, r5 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
	}

	{
		tuple := Tuple6[string, int, float64, bool, string, int]{"a", 1, 1.0, true, "b", 2}

		r1, r2, r3, r4, r5, r6 := Unpack6(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)

		r1, r2, r3, r4, r5, r6 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
	}

	{
		tuple := Tuple7[string, int, float64, bool, string, int, float64]{"a", 1, 1.0, true, "b", 2, 3.0}

		r1, r2, r3, r4, r5, r6, r7 := Unpack7(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
		is.Equal(3.0, r7)

		r1, r2, r3, r4, r5, r6, r7 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
		is.Equal(3.0, r7)
	}

	{
		tuple := Tuple8[string, int, float64, bool, string, int, float64, bool]{"a", 1, 1.0, true, "b", 2, 3.0, true}

		r1, r2, r3, r4, r5, r6, r7, r8 := Unpack8(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
		is.Equal(3.0, r7)
		is.True(r8)

		r1, r2, r3, r4, r5, r6, r7, r8 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
		is.Equal(3.0, r7)
		is.True(r8)
	}

	{
		tuple := Tuple9[string, int, float64, bool, string, int, float64, bool, string]{"a", 1, 1.0, true, "b", 2, 3.0, true, "c"}

		r1, r2, r3, r4, r5, r6, r7, r8, r9 := Unpack9(tuple)

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
		is.Equal(3.0, r7)
		is.True(r8)
		is.Equal("c", r9)

		r1, r2, r3, r4, r5, r6, r7, r8, r9 = tuple.Unpack()

		is.Equal("a", r1)
		is.Equal(1, r2)
		is.Equal(1.0, r3)
		is.True(r4)
		is.Equal("b", r5)
		is.Equal(2, r6)
		is.Equal(3.0, r7)
		is.True(r8)
		is.Equal("c", r9)
	}
}

func TestZip(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	r1 := Zip2(
		[]string{"a", "b"},
		[]int{1, 2},
	)

	r2 := Zip3(
		[]string{"a", "b", "c"},
		[]int{1, 2, 3},
		[]int{4, 5, 6},
	)

	r3 := Zip4(
		[]string{"a", "b", "c", "d"},
		[]int{1, 2, 3, 4},
		[]int{5, 6, 7, 8},
		[]bool{true, true, true, true},
	)

	r4 := Zip5(
		[]string{"a", "b", "c", "d", "e"},
		[]int{1, 2, 3, 4, 5},
		[]int{6, 7, 8, 9, 10},
		[]bool{true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5},
	)

	r5 := Zip6(
		[]string{"a", "b", "c", "d", "e", "f"},
		[]int{1, 2, 3, 4, 5, 6},
		[]int{7, 8, 9, 10, 11, 12},
		[]bool{true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06},
	)

	r6 := Zip7(
		[]string{"a", "b", "c", "d", "e", "f", "g"},
		[]int{1, 2, 3, 4, 5, 6, 7},
		[]int{8, 9, 10, 11, 12, 13, 14},
		[]bool{true, true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07},
		[]int8{1, 2, 3, 4, 5, 6, 7},
	)

	r7 := Zip8(
		[]string{"a", "b", "c", "d", "e", "f", "g", "h"},
		[]int{1, 2, 3, 4, 5, 6, 7, 8},
		[]int{9, 10, 11, 12, 13, 14, 15, 16},
		[]bool{true, true, true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08},
		[]int8{1, 2, 3, 4, 5, 6, 7, 8},
		[]int16{1, 2, 3, 4, 5, 6, 7, 8},
	)

	r8 := Zip9(
		[]string{"a", "b", "c", "d", "e", "f", "g", "h", "i"},
		[]int{1, 2, 3, 4, 5, 6, 7, 8, 9},
		[]int{10, 11, 12, 13, 14, 15, 16, 17, 18},
		[]bool{true, true, true, true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09},
		[]int8{1, 2, 3, 4, 5, 6, 7, 8, 9},
		[]int16{1, 2, 3, 4, 5, 6, 7, 8, 9},
		[]int32{1, 2, 3, 4, 5, 6, 7, 8, 9},
	)

	is.Equal([]Tuple2[string, int]{
		{A: "a", B: 1},
		{A: "b", B: 2},
	}, r1)

	is.Equal([]Tuple3[string, int, int]{
		{A: "a", B: 1, C: 4},
		{A: "b", B: 2, C: 5},
		{A: "c", B: 3, C: 6},
	}, r2)

	is.Equal([]Tuple4[string, int, int, bool]{
		{A: "a", B: 1, C: 5, D: true},
		{A: "b", B: 2, C: 6, D: true},
		{A: "c", B: 3, C: 7, D: true},
		{A: "d", B: 4, C: 8, D: true},
	}, r3)

	is.Equal([]Tuple5[string, int, int, bool, float32]{
		{A: "a", B: 1, C: 6, D: true, E: 0.1},
		{A: "b", B: 2, C: 7, D: true, E: 0.2},
		{A: "c", B: 3, C: 8, D: true, E: 0.3},
		{A: "d", B: 4, C: 9, D: true, E: 0.4},
		{A: "e", B: 5, C: 10, D: true, E: 0.5},
	}, r4)

	is.Equal([]Tuple6[string, int, int, bool, float32, float64]{
		{A: "a", B: 1, C: 7, D: true, E: 0.1, F: 0.01},
		{A: "b", B: 2, C: 8, D: true, E: 0.2, F: 0.02},
		{A: "c", B: 3, C: 9, D: true, E: 0.3, F: 0.03},
		{A: "d", B: 4, C: 10, D: true, E: 0.4, F: 0.04},
		{A: "e", B: 5, C: 11, D: true, E: 0.5, F: 0.05},
		{A: "f", B: 6, C: 12, D: true, E: 0.6, F: 0.06},
	}, r5)

	is.Equal([]Tuple7[string, int, int, bool, float32, float64, int8]{
		{A: "a", B: 1, C: 8, D: true, E: 0.1, F: 0.01, G: 1},
		{A: "b", B: 2, C: 9, D: true, E: 0.2, F: 0.02, G: 2},
		{A: "c", B: 3, C: 10, D: true, E: 0.3, F: 0.03, G: 3},
		{A: "d", B: 4, C: 11, D: true, E: 0.4, F: 0.04, G: 4},
		{A: "e", B: 5, C: 12, D: true, E: 0.5, F: 0.05, G: 5},
		{A: "f", B: 6, C: 13, D: true, E: 0.6, F: 0.06, G: 6},
		{A: "g", B: 7, C: 14, D: true, E: 0.7, F: 0.07, G: 7},
	}, r6)

	is.Equal([]Tuple8[string, int, int, bool, float32, float64, int8, int16]{
		{A: "a", B: 1, C: 9, D: true, E: 0.1, F: 0.01, G: 1, H: 1},
		{A: "b", B: 2, C: 10, D: true, E: 0.2, F: 0.02, G: 2, H: 2},
		{A: "c", B: 3, C: 11, D: true, E: 0.3, F: 0.03, G: 3, H: 3},
		{A: "d", B: 4, C: 12, D: true, E: 0.4, F: 0.04, G: 4, H: 4},
		{A: "e", B: 5, C: 13, D: true, E: 0.5, F: 0.05, G: 5, H: 5},
		{A: "f", B: 6, C: 14, D: true, E: 0.6, F: 0.06, G: 6, H: 6},
		{A: "g", B: 7, C: 15, D: true, E: 0.7, F: 0.07, G: 7, H: 7},
		{A: "h", B: 8, C: 16, D: true, E: 0.8, F: 0.08, G: 8, H: 8},
	}, r7)

	is.Equal([]Tuple9[string, int, int, bool, float32, float64, int8, int16, int32]{
		{A: "a", B: 1, C: 10, D: true, E: 0.1, F: 0.01, G: 1, H: 1, I: 1},
		{A: "b", B: 2, C: 11, D: true, E: 0.2, F: 0.02, G: 2, H: 2, I: 2},
		{A: "c", B: 3, C: 12, D: true, E: 0.3, F: 0.03, G: 3, H: 3, I: 3},
		{A: "d", B: 4, C: 13, D: true, E: 0.4, F: 0.04, G: 4, H: 4, I: 4},
		{A: "e", B: 5, C: 14, D: true, E: 0.5, F: 0.05, G: 5, H: 5, I: 5},
		{A: "f", B: 6, C: 15, D: true, E: 0.6, F: 0.06, G: 6, H: 6, I: 6},
		{A: "g", B: 7, C: 16, D: true, E: 0.7, F: 0.07, G: 7, H: 7, I: 7},
		{A: "h", B: 8, C: 17, D: true, E: 0.8, F: 0.08, G: 8, H: 8, I: 8},
		{A: "i", B: 9, C: 18, D: true, E: 0.9, F: 0.09, G: 9, H: 9, I: 9},
	}, r8)
}

func TestZipBy(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	r1 := ZipBy2(
		[]string{"a", "b"},
		[]int{1, 2},
		T2[string, int],
	)

	r2 := ZipBy3(
		[]string{"a", "b", "c"},
		[]int{1, 2, 3},
		[]int{4, 5, 6},
		T3[string, int, int],
	)

	r3 := ZipBy4(
		[]string{"a", "b", "c", "d"},
		[]int{1, 2, 3, 4},
		[]int{5, 6, 7, 8},
		[]bool{true, true, true, true},
		T4[string, int, int, bool],
	)

	r4 := ZipBy5(
		[]string{"a", "b", "c", "d", "e"},
		[]int{1, 2, 3, 4, 5},
		[]int{6, 7, 8, 9, 10},
		[]bool{true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5},
		T5[string, int, int, bool, float32],
	)

	r5 := ZipBy6(
		[]string{"a", "b", "c", "d", "e", "f"},
		[]int{1, 2, 3, 4, 5, 6},
		[]int{7, 8, 9, 10, 11, 12},
		[]bool{true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06},
		T6[string, int, int, bool, float32, float64],
	)

	r6 := ZipBy7(
		[]string{"a", "b", "c", "d", "e", "f", "g"},
		[]int{1, 2, 3, 4, 5, 6, 7},
		[]int{8, 9, 10, 11, 12, 13, 14},
		[]bool{true, true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07},
		[]int8{1, 2, 3, 4, 5, 6, 7},
		T7[string, int, int, bool, float32, float64, int8],
	)

	r7 := ZipBy8(
		[]string{"a", "b", "c", "d", "e", "f", "g", "h"},
		[]int{1, 2, 3, 4, 5, 6, 7, 8},
		[]int{9, 10, 11, 12, 13, 14, 15, 16},
		[]bool{true, true, true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08},
		[]int8{1, 2, 3, 4, 5, 6, 7, 8},
		[]int16{1, 2, 3, 4, 5, 6, 7, 8},
		T8[string, int, int, bool, float32, float64, int8, int16],
	)

	r8 := ZipBy9(
		[]string{"a", "b", "c", "d", "e", "f", "g", "h", "i"},
		[]int{1, 2, 3, 4, 5, 6, 7, 8, 9},
		[]int{10, 11, 12, 13, 14, 15, 16, 17, 18},
		[]bool{true, true, true, true, true, true, true, true, true},
		[]float32{0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9},
		[]float64{0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09},
		[]int8{1, 2, 3, 4, 5, 6, 7, 8, 9},
		[]int16{1, 2, 3, 4, 5, 6, 7, 8, 9},
		[]int32{1, 2, 3, 4, 5, 6, 7, 8, 9},
		T9[string, int, int, bool, float32, float64, int8, int16, int32],
	)

	is.Equal([]Tuple2[string, int]{
		{A: "a", B: 1},
		{A: "b", B: 2},
	}, r1)

	is.Equal([]Tuple3[string, int, int]{
		{A: "a", B: 1, C: 4},
		{A: "b", B: 2, C: 5},
		{A: "c", B: 3, C: 6},
	}, r2)

	is.Equal([]Tuple4[string, int, int, bool]{
		{A: "a", B: 1, C: 5, D: true},
		{A: "b", B: 2, C: 6, D: true},
		{A: "c", B: 3, C: 7, D: true},
		{A: "d", B: 4, C: 8, D: true},
	}, r3)

	is.Equal([]Tuple5[string, int, int, bool, float32]{
		{A: "a", B: 1, C: 6, D: true, E: 0.1},
		{A: "b", B: 2, C: 7, D: true, E: 0.2},
		{A: "c", B: 3, C: 8, D: true, E: 0.3},
		{A: "d", B: 4, C: 9, D: true, E: 0.4},
		{A: "e", B: 5, C: 10, D: true, E: 0.5},
	}, r4)

	is.Equal([]Tuple6[string, int, int, bool, float32, float64]{
		{A: "a", B: 1, C: 7, D: true, E: 0.1, F: 0.01},
		{A: "b", B: 2, C: 8, D: true, E: 0.2, F: 0.02},
		{A: "c", B: 3, C: 9, D: true, E: 0.3, F: 0.03},
		{A: "d", B: 4, C: 10, D: true, E: 0.4, F: 0.04},
		{A: "e", B: 5, C: 11, D: true, E: 0.5, F: 0.05},
		{A: "f", B: 6, C: 12, D: true, E: 0.6, F: 0.06},
	}, r5)

	is.Equal([]Tuple7[string, int, int, bool, float32, float64, int8]{
		{A: "a", B: 1, C: 8, D: true, E: 0.1, F: 0.01, G: 1},
		{A: "b", B: 2, C: 9, D: true, E: 0.2, F: 0.02, G: 2},
		{A: "c", B: 3, C: 10, D: true, E: 0.3, F: 0.03, G: 3},
		{A: "d", B: 4, C: 11, D: true, E: 0.4, F: 0.04, G: 4},
		{A: "e", B: 5, C: 12, D: true, E: 0.5, F: 0.05, G: 5},
		{A: "f", B: 6, C: 13, D: true, E: 0.6, F: 0.06, G: 6},
		{A: "g", B: 7, C: 14, D: true, E: 0.7, F: 0.07, G: 7},
	}, r6)

	is.Equal([]Tuple8[string, int, int, bool, float32, float64, int8, int16]{
		{A: "a", B: 1, C: 9, D: true, E: 0.1, F: 0.01, G: 1, H: 1},
		{A: "b", B: 2, C: 10, D: true, E: 0.2, F: 0.02, G: 2, H: 2},
		{A: "c", B: 3, C: 11, D: true, E: 0.3, F: 0.03, G: 3, H: 3},
		{A: "d", B: 4, C: 12, D: true, E: 0.4, F: 0.04, G: 4, H: 4},
		{A: "e", B: 5, C: 13, D: true, E: 0.5, F: 0.05, G: 5, H: 5},
		{A: "f", B: 6, C: 14, D: true, E: 0.6, F: 0.06, G: 6, H: 6},
		{A: "g", B: 7, C: 15, D: true, E: 0.7, F: 0.07, G: 7, H: 7},
		{A: "h", B: 8, C: 16, D: true, E: 0.8, F: 0.08, G: 8, H: 8},
	}, r7)

	is.Equal([]Tuple9[string, int, int, bool, float32, float64, int8, int16, int32]{
		{A: "a", B: 1, C: 10, D: true, E: 0.1, F: 0.01, G: 1, H: 1, I: 1},
		{A: "b", B: 2, C: 11, D: true, E: 0.2, F: 0.02, G: 2, H: 2, I: 2},
		{A: "c", B: 3, C: 12, D: true, E: 0.3, F: 0.03, G: 3, H: 3, I: 3},
		{A: "d", B: 4, C: 13, D: true, E: 0.4, F: 0.04, G: 4, H: 4, I: 4},
		{A: "e", B: 5, C: 14, D: true, E: 0.5, F: 0.05, G: 5, H: 5, I: 5},
		{A: "f", B: 6, C: 15, D: true, E: 0.6, F: 0.06, G: 6, H: 6, I: 6},
		{A: "g", B: 7, C: 16, D: true, E: 0.7, F: 0.07, G: 7, H: 7, I: 7},
		{A: "h", B: 8, C: 17, D: true, E: 0.8, F: 0.08, G: 8, H: 8, I: 8},
		{A: "i", B: 9, C: 18, D: true, E: 0.9, F: 0.09, G: 9, H: 9, I: 9},
	}, r8)
}

func TestUnzip(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	r1, r2 := Unzip2([]Tuple2[string, int]{{A: "a", B: 1}, {A: "b", B: 2}})

	is.Equal([]string{"a", "b"}, r1)
	is.Equal([]int{1, 2}, r2)
}

func TestUnzipBy(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	r1, r2 := UnzipBy2([]Tuple2[string, int]{{A: "a", B: 1}, {A: "b", B: 2}}, func(i Tuple2[string, int]) (string, int) {
		return i.A + i.A, i.B + i.B
	})

	is.Equal([]string{"aa", "bb"}, r1)
	is.Equal([]int{2, 4}, r2)
}

func TestZipByErr(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	// Test ZipByErr2
	t.Run("ZipByErr2", func(t *testing.T) {
		t.Parallel()

		tests := []struct {
			name                  string
			a                     []string
			b                     []int
			iteratee              func(a string, b int) (string, error)
			wantResult            []string
			wantErr               bool
			errMsg                string
			expectedCallbackCount int
		}{
			{
				name:  "successful transformation",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				iteratee: func(a string, b int) (string, error) {
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            []string{"a-1", "b-2"},
				wantErr:               false,
				expectedCallbackCount: 2,
			},
			{
				name:  "error at second element stops iteration",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				iteratee: func(a string, b int) (string, error) {
					if b == 2 {
						return "", errors.New("number 2 is not allowed")
					}
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            nil,
				wantErr:               true,
				errMsg:                "number 2 is not allowed",
				expectedCallbackCount: 2,
			},
			{
				name:  "error at first element stops iteration immediately",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				iteratee: func(a string, b int) (string, error) {
					return "", errors.New("first error")
				},
				wantResult:            nil,
				wantErr:               true,
				errMsg:                "first error",
				expectedCallbackCount: 1,
			},
			{
				name:  "empty input slices",
				a:     []string{},
				b:     []int{},
				iteratee: func(a string, b int) (string, error) {
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            []string{},
				wantErr:               false,
				expectedCallbackCount: 0,
			},
			{
				name:  "unequal slice lengths - zero value filled",
				a:     []string{"a", "b", "c"},
				b:     []int{1},
				iteratee: func(a string, b int) (string, error) {
					if b == 0 {
						return "", errors.New("zero value not allowed")
					}
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            nil,
				wantErr:               true,
				errMsg:                "zero value not allowed",
				expectedCallbackCount: 2,
			},
		}

		for _, tt := range tests {
			tt := tt
			t.Run(tt.name, func(t *testing.T) {
				t.Parallel()

				callbackCount := 0
				iteratee := func(a string, b int) (string, error) {
					callbackCount++
					return tt.iteratee(a, b)
				}

				result, err := ZipByErr2(tt.a, tt.b, iteratee)

				is.Equal(tt.wantResult, result)
				if tt.wantErr {
					is.Error(err)
					if tt.errMsg != "" {
						is.ErrorContains(err, tt.errMsg)
					}
				} else {
					is.NoError(err)
				}
				is.Equal(tt.expectedCallbackCount, callbackCount)
			})
		}
	})

	// Test ZipByErr3
	t.Run("ZipByErr3", func(t *testing.T) {
		t.Parallel()

		tests := []struct {
			name                  string
			a                     []string
			b                     []int
			c                     []bool
			iteratee              func(a string, b int, c bool) (string, error)
			wantResult            []string
			wantErr               bool
			errMsg                string
			expectedCallbackCount int
		}{
			{
				name:  "successful transformation",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				c:     []bool{true, false},
				iteratee: func(a string, b int, c bool) (string, error) {
					return a + "-" + strconv.Itoa(b) + "-" + strconv.FormatBool(c), nil
				},
				wantResult:            []string{"a-1-true", "b-2-false"},
				wantErr:               false,
				expectedCallbackCount: 2,
			},
			{
				name:  "error at second element stops iteration",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				c:     []bool{true, false},
				iteratee: func(a string, b int, c bool) (string, error) {
					if b == 2 {
						return "", errors.New("number 2 is not allowed")
					}
					return a + "-" + strconv.Itoa(b) + "-" + strconv.FormatBool(c), nil
				},
				wantResult:            nil,
				wantErr:               true,
				errMsg:                "number 2 is not allowed",
				expectedCallbackCount: 2,
			},
			{
				name:  "error at first element",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				c:     []bool{true, false},
				iteratee: func(a string, b int, c bool) (string, error) {
					return "", errors.New("first error")
				},
				wantResult:            nil,
				wantErr:               true,
				errMsg:                "first error",
				expectedCallbackCount: 1,
			},
			{
				name:  "empty input slices",
				a:     []string{},
				b:     []int{},
				c:     []bool{},
				iteratee: func(a string, b int, c bool) (string, error) {
					return a + "-" + strconv.Itoa(b) + "-" + strconv.FormatBool(c), nil
				},
				wantResult:            []string{},
				wantErr:               false,
				expectedCallbackCount: 0,
			},
		}

		for _, tt := range tests {
			tt := tt
			t.Run(tt.name, func(t *testing.T) {
				t.Parallel()

				callbackCount := 0
				iteratee := func(a string, b int, c bool) (string, error) {
					callbackCount++
					return tt.iteratee(a, b, c)
				}

				result, err := ZipByErr3(tt.a, tt.b, tt.c, iteratee)

				is.Equal(tt.wantResult, result)
				if tt.wantErr {
					is.Error(err)
					if tt.errMsg != "" {
						is.ErrorContains(err, tt.errMsg)
					}
				} else {
					is.NoError(err)
				}
				is.Equal(tt.expectedCallbackCount, callbackCount)
			})
		}
	})

	// Test ZipByErr4
	t.Run("ZipByErr4", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		tests := []struct {
			name                  string
			a                     []string
			b                     []int
			c                     []bool
			d                     []float32
			iteratee              func(a string, b int, c bool, d float32) (string, error)
			wantResult            []string
			wantErr               bool
			expectedCallbackCount int
		}{
			{
				name:  "successful transformation",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				c:     []bool{true, false},
				d:     []float32{1.1, 2.2},
				iteratee: func(a string, b int, c bool, d float32) (string, error) {
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            []string{"a-1", "b-2"},
				wantErr:               false,
				expectedCallbackCount: 2,
			},
			{
				name:  "error stops iteration",
				a:     []string{"a", "b"},
				b:     []int{1, 2},
				c:     []bool{true, false},
				d:     []float32{1.1, 2.2},
				iteratee: func(a string, b int, c bool, d float32) (string, error) {
					if b == 2 {
						return "", errors.New("error")
					}
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            nil,
				wantErr:               true,
				expectedCallbackCount: 2,
			},
		}

		for _, tt := range tests {
			tt := tt
			t.Run(tt.name, func(t *testing.T) {
				t.Parallel()

				callbackCount := 0
				iteratee := func(a string, b int, c bool, d float32) (string, error) {
					callbackCount++
					return tt.iteratee(a, b, c, d)
				}

				result, err := ZipByErr4(tt.a, tt.b, tt.c, tt.d, iteratee)

				is.Equal(tt.wantResult, result)
				if tt.wantErr {
					is.Error(err)
				} else {
					is.NoError(err)
				}
				is.Equal(tt.expectedCallbackCount, callbackCount)
			})
		}
	})

	// Test ZipByErr5
	t.Run("ZipByErr5", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := ZipByErr5(
			[]string{"a", "b"},
			[]int{1, 2},
			[]bool{true, false},
			[]float32{1.1, 2.2},
			[]float64{0.1, 0.2},
			func(a string, b int, c bool, d float32, e float64) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal([]string{"a-1", "b-2"}, result)
		is.NoError(err)
		is.Equal(2, callbackCount)
	})

	// Test ZipByErr6
	t.Run("ZipByErr6", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := ZipByErr6(
			[]string{"a", "b"},
			[]int{1, 2},
			[]bool{true, false},
			[]float32{1.1, 2.2},
			[]float64{0.1, 0.2},
			[]int8{1, 2},
			func(a string, b int, c bool, d float32, e float64, f int8) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal([]string{"a-1", "b-2"}, result)
		is.NoError(err)
		is.Equal(2, callbackCount)
	})

	// Test ZipByErr7
	t.Run("ZipByErr7", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := ZipByErr7(
			[]string{"a", "b"},
			[]int{1, 2},
			[]bool{true, false},
			[]float32{1.1, 2.2},
			[]float64{0.1, 0.2},
			[]int8{1, 2},
			[]int16{3, 4},
			func(a string, b int, c bool, d float32, e float64, f int8, g int16) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal([]string{"a-1", "b-2"}, result)
		is.NoError(err)
		is.Equal(2, callbackCount)
	})

	// Test ZipByErr8
	t.Run("ZipByErr8", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := ZipByErr8(
			[]string{"a", "b"},
			[]int{1, 2},
			[]bool{true, false},
			[]float32{1.1, 2.2},
			[]float64{0.1, 0.2},
			[]int8{1, 2},
			[]int16{3, 4},
			[]int32{5, 6},
			func(a string, b int, c bool, d float32, e float64, f int8, g int16, h int32) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal([]string{"a-1", "b-2"}, result)
		is.NoError(err)
		is.Equal(2, callbackCount)
	})

	// Test ZipByErr9
	t.Run("ZipByErr9", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := ZipByErr9(
			[]string{"a", "b"},
			[]int{1, 2},
			[]bool{true, false},
			[]float32{1.1, 2.2},
			[]float64{0.1, 0.2},
			[]int8{1, 2},
			[]int16{3, 4},
			[]int32{5, 6},
			[]int64{7, 8},
			func(a string, b int, c bool, d float32, e float64, f int8, g int16, h int32, i int64) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal([]string{"a-1", "b-2"}, result)
		is.NoError(err)
		is.Equal(2, callbackCount)
	})
}

func TestCrossJoin(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	listOne := []string{"a", "b", "c"}
	listTwo := []int{1, 2, 3}
	emptyList := []any{}
	mixedList := []any{9.6, 4, "foobar"}

	results1 := CrossJoin2(emptyList, listTwo)
	is.Empty(results1)

	results2 := CrossJoin2(listOne, emptyList)
	is.Empty(results2)

	results3 := CrossJoin2(emptyList, emptyList)
	is.Empty(results3)

	results4 := CrossJoin2([]string{"a"}, listTwo)
	is.Equal([]Tuple2[string, int]{T2("a", 1), T2("a", 2), T2("a", 3)}, results4)

	results5 := CrossJoin2(listOne, []int{1})
	is.Equal([]Tuple2[string, int]{T2("a", 1), T2("b", 1), T2("c", 1)}, results5)

	results6 := CrossJoin2(listOne, listTwo)
	is.Equal([]Tuple2[string, int]{T2("a", 1), T2("a", 2), T2("a", 3), T2("b", 1), T2("b", 2), T2("b", 3), T2("c", 1), T2("c", 2), T2("c", 3)}, results6)

	results7 := CrossJoin2(listOne, mixedList)
	is.Equal([]Tuple2[string, any]{T2[string, any]("a", 9.6), T2[string, any]("a", 4), T2[string, any]("a", "foobar"), T2[string, any]("b", 9.6), T2[string, any]("b", 4), T2[string, any]("b", "foobar"), T2[string, any]("c", 9.6), T2[string, any]("c", 4), T2[string, any]("c", "foobar")}, results7)
}

func TestCrossJoinBy(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	listOne := []string{"a", "b", "c"}
	listTwo := []int{1, 2, 3}
	emptyList := []any{}
	mixedList := []any{9.6, 4, "foobar"}

	results1 := CrossJoinBy2(emptyList, listTwo, T2[any, int])
	is.Empty(results1)

	results2 := CrossJoinBy2(listOne, emptyList, T2[string, any])
	is.Empty(results2)

	results3 := CrossJoinBy2(emptyList, emptyList, T2[any, any])
	is.Empty(results3)

	results4 := CrossJoinBy2([]string{"a"}, listTwo, T2[string, int])
	is.Equal([]Tuple2[string, int]{T2("a", 1), T2("a", 2), T2("a", 3)}, results4)

	results5 := CrossJoinBy2(listOne, []int{1}, T2[string, int])
	is.Equal([]Tuple2[string, int]{T2("a", 1), T2("b", 1), T2("c", 1)}, results5)

	results6 := CrossJoinBy2(listOne, listTwo, T2[string, int])
	is.Equal([]Tuple2[string, int]{T2("a", 1), T2("a", 2), T2("a", 3), T2("b", 1), T2("b", 2), T2("b", 3), T2("c", 1), T2("c", 2), T2("c", 3)}, results6)

	results7 := CrossJoinBy2(listOne, mixedList, T2[string, any])
	is.Equal([]Tuple2[string, any]{T2[string, any]("a", 9.6), T2[string, any]("a", 4), T2[string, any]("a", "foobar"), T2[string, any]("b", 9.6), T2[string, any]("b", 4), T2[string, any]("b", "foobar"), T2[string, any]("c", 9.6), T2[string, any]("c", 4), T2[string, any]("c", "foobar")}, results7)
}

func TestCrossJoinByErr(t *testing.T) {
	t.Parallel()
	is := assert.New(t)

	// Test CrossJoinByErr2
	t.Run("CrossJoinByErr2", func(t *testing.T) {
		t.Parallel()

		tests := []struct {
			name                  string
			listA                 []string
			listB                 []int
			transform             func(a string, b int) (string, error)
			wantResult            []string
			wantErr               bool
			errMsg                string
			expectedCallbackCount int
		}{
			{
				name:  "successful transformation",
				listA: []string{"a", "b"},
				listB: []int{1, 2},
				transform: func(a string, b int) (string, error) {
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            []string{"a-1", "a-2", "b-1", "b-2"},
				wantErr:               false,
				expectedCallbackCount: 4,
			},
			{
				name:  "error stops iteration early",
				listA: []string{"a", "b"},
				listB: []int{1, 2},
				transform: func(a string, b int) (string, error) {
					if a == "b" {
						return "", errors.New("b not allowed")
					}
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            nil,
				wantErr:               true,
				errMsg:                "b not allowed",
				expectedCallbackCount: 3, // a-1, a-2, then b-1 errors
			},
			{
				name:      "empty list returns empty result",
				listA:     []string{},
				listB:     []int{1, 2},
				transform: func(a string, b int) (string, error) { return a + "-" + strconv.Itoa(b), nil },
				wantResult:            []string{},
				wantErr:               false,
				expectedCallbackCount: 0,
			},
		}

		for _, tt := range tests {
			tt := tt
			t.Run(tt.name, func(t *testing.T) {
				t.Parallel()

				callbackCount := 0
				transform := func(a string, b int) (string, error) {
					callbackCount++
					return tt.transform(a, b)
				}

				result, err := CrossJoinByErr2(tt.listA, tt.listB, transform)

				is.Equal(tt.wantResult, result)
				if tt.wantErr {
					is.Error(err)
					if tt.errMsg != "" {
						is.ErrorContains(err, tt.errMsg)
					}
				} else {
					is.NoError(err)
				}
				is.Equal(tt.expectedCallbackCount, callbackCount)
			})
		}
	})

	// Test CrossJoinByErr3
	t.Run("CrossJoinByErr3", func(t *testing.T) {
		t.Parallel()

		tests := []struct {
			name                  string
			listA                 []string
			listB                 []int
			listC                 []bool
			transform             func(a string, b int, c bool) (string, error)
			wantResult            []string
			wantErr               bool
			expectedCallbackCount int
		}{
			{
				name:  "successful transformation",
				listA: []string{"a", "b"},
				listB: []int{1, 2},
				listC: []bool{true, false},
				transform: func(a string, b int, c bool) (string, error) {
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            []string{"a-1", "a-1", "a-2", "a-2", "b-1", "b-1", "b-2", "b-2"},
				wantErr:               false,
				expectedCallbackCount: 8,
			},
			{
				name:  "error stops iteration early",
				listA: []string{"a", "b"},
				listB: []int{1, 2},
				listC: []bool{true, false},
				transform: func(a string, b int, c bool) (string, error) {
					if a == "b" && b == 2 {
						return "", errors.New("error")
					}
					return a + "-" + strconv.Itoa(b), nil
				},
				wantResult:            nil,
				wantErr:               true,
				expectedCallbackCount: 7,
			},
		}

		for _, tt := range tests {
			tt := tt
			t.Run(tt.name, func(t *testing.T) {
				t.Parallel()

				callbackCount := 0
				transform := func(a string, b int, c bool) (string, error) {
					callbackCount++
					return tt.transform(a, b, c)
				}

				result, err := CrossJoinByErr3(tt.listA, tt.listB, tt.listC, transform)

				is.Equal(tt.wantResult, result)
				if tt.wantErr {
					is.Error(err)
				} else {
					is.NoError(err)
				}
				is.Equal(tt.expectedCallbackCount, callbackCount)
			})
		}
	})

	// Test CrossJoinByErr4
	t.Run("CrossJoinByErr4", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := CrossJoinByErr4(
			[]string{"a", "b"},
			[]int{1, 2},
			[]bool{true},
			[]float32{1.1},
			func(a string, b int, c bool, d float32) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal(4, len(result))
		is.NoError(err)
		is.Equal(4, callbackCount)
	})

	// Test CrossJoinByErr5
	t.Run("CrossJoinByErr5", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := CrossJoinByErr5(
			[]string{"a", "b"},
			[]int{1},
			[]bool{true},
			[]float32{1.1},
			[]float64{2.2},
			func(a string, b int, c bool, d float32, e float64) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal(2, len(result))
		is.NoError(err)
		is.Equal(2, callbackCount)
	})

	// Test CrossJoinByErr6
	t.Run("CrossJoinByErr6", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := CrossJoinByErr6(
			[]string{"a"},
			[]int{1},
			[]bool{true},
			[]float32{1.1},
			[]float64{2.2},
			[]int8{3},
			func(a string, b int, c bool, d float32, e float64, f int8) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal(1, len(result))
		is.NoError(err)
		is.Equal(1, callbackCount)
	})

	// Test CrossJoinByErr7
	t.Run("CrossJoinByErr7", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := CrossJoinByErr7(
			[]string{"a"},
			[]int{1},
			[]bool{true},
			[]float32{1.1},
			[]float64{2.2},
			[]int8{3},
			[]int16{4},
			func(a string, b int, c bool, d float32, e float64, f int8, g int16) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal(1, len(result))
		is.NoError(err)
		is.Equal(1, callbackCount)
	})

	// Test CrossJoinByErr8
	t.Run("CrossJoinByErr8", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := CrossJoinByErr8(
			[]string{"a"},
			[]int{1},
			[]bool{true},
			[]float32{1.1},
			[]float64{2.2},
			[]int8{3},
			[]int16{4},
			[]int32{5},
			func(a string, b int, c bool, d float32, e float64, f int8, g int16, h int32) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal(1, len(result))
		is.NoError(err)
		is.Equal(1, callbackCount)
	})

	// Test CrossJoinByErr9
	t.Run("CrossJoinByErr9", func(t *testing.T) {
		t.Parallel()
		is := assert.New(t)

		callbackCount := 0
		result, err := CrossJoinByErr9(
			[]string{"a"},
			[]int{1},
			[]bool{true},
			[]float32{1.1},
			[]float64{2.2},
			[]int8{3},
			[]int16{4},
			[]int32{5},
			[]int64{6},
			func(a string, b int, c bool, d float32, e float64, f int8, g int16, h int32, i int64) (string, error) {
				callbackCount++
				return a + "-" + strconv.Itoa(b), nil
			},
		)

		is.Equal(1, len(result))
		is.NoError(err)
		is.Equal(1, callbackCount)
	})
}