mirror of
https://github.com/samber/lo.git
synced 2026-04-22 23:47:11 +08:00
Nathan Baulch
e7386d9246
* Fix linting * Use is.ElementsMatch This will ignore the ordering of the final intersection. Especially important when checking old versions of go that do not guarantee an order when iterating through maps. * lint: fix inconsistent callback function parameter names * lint: rename "iteratee" to "transform" for *Map helpers * lint: rename "project" parameters to "transform" * lint: rename "cb" parameters to "callback" * lint: rename "iteratee" to "callback" for ForEach helpers --------- Co-authored-by: Franky W. <frankywahl@users.noreply.github.com> Co-authored-by: Samuel Berthe <dev@samuel-berthe.fr>
75 lines
1.5 KiB
Markdown
75 lines
1.5 KiB
Markdown
---
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name: Switch
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slug: switch
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sourceRef: condition.go#L101
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category: core
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subCategory: condition
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playUrl: https://go.dev/play/p/TGbKUMAeRUd
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variantHelpers:
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- core#condition#switch
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- core#condition#case
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- core#condition#casef
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- core#condition#default
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- core#condition#defaultf
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similarHelpers:
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- core#condition#if
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- core#condition#ternary
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- core#condition#validate
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position: 20
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signatures:
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- "func Switch[T comparable, R any](predicate T) *switchCase[T, R]"
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- "func (s *switchCase[T, R]) Case(val T, result R) *switchCase[T, R]"
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- "func (s *switchCase[T, R]) CaseF(val T, callback func() R) *switchCase[T, R]"
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- "func (s *switchCase[T, R]) Default(result R) R"
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- "func (s *switchCase[T, R]) DefaultF(callback func() R) R"
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---
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Starts a functional switch/case/default chain using a predicate value.
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```go
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result := lo.Switch(2).Case(1, "1").Case(2, "2").Default("3")
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// "2"
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```
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### Case
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Adds a Case branch to a Switch chain returning a constant result.
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```go
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result := lo.Switch(1).Case(1, "1").Default("?")
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// "1"
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```
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### CaseF
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Adds a Case branch that lazily computes its result.
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```go
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result := lo.Switch(2).CaseF(2, func() string {
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return "2"
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}).Default("?")
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// "2"
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```
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### Default
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Completes the Switch chain by providing a default result when no Case matched.
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```go
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result := lo.Switch(42).Default("none")
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// "none"
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```
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### DefaultF
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Function form of Default. Lazily computes the default result when no Case matched.
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```go
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result := lo.Switch(0).Case(1, "1").DefaultF(func() string {
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return "3"
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})
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// "3"
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```
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