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Add applyIf, applyUnless, alsoIf, alsoUnless scope functions #5373

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Add applyIf, applyUnless, alsoIf, alsoUnless scope functions #5373

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32 changes: 32 additions & 0 deletions libraries/stdlib/src/kotlin/util/Standard.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,22 @@ public inline fun <T> T.apply(block: T.() -> Unit): T {
return this
}

/**
* If the predicate is true, calls the specified function [block] with `this` value as its receiver. Always returns `this` value.
*
* For detailed usage information see the documentation for [scope functions](https://kotlinlang.org/docs/reference/scope-functions.html#apply).
*/
@kotlin.internal.InlineOnly
public inline fun <T> T.applyIf(predicate: Boolean, block: T.() -> Unit): T = if (predicate) apply(block) else this

/**
* Unless the predicate is true, calls the specified function [block] with `this` value as its receiver. Always returns `this` value.
*
* For detailed usage information see the documentation for [scope functions](https://kotlinlang.org/docs/reference/scope-functions.html#apply).
*/
@kotlin.internal.InlineOnly
public inline fun <T> T.applyUnless(predicate: Boolean, block: T.() -> Unit): T = if (!predicate) apply(block) else this

/**
* Calls the specified function [block] with `this` value as its argument and returns `this` value.
*
Expand All @@ -99,6 +115,22 @@ public inline fun <T> T.also(block: (T) -> Unit): T {
return this
}

/**
* If the predicate is true, calls the specified function [block] with `this` value as its receiver. Always returns `this` value.
*
* For detailed usage information see the documentation for [scope functions](https://kotlinlang.org/docs/reference/scope-functions.html#apply).
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copy-and-paste

*/
@kotlin.internal.InlineOnly
public inline fun <T> T.alsoIf(predicate: Boolean, block: (T) -> Unit): T = if (predicate) also(block) else this

/**
* Unless the predicate is true, calls the specified function [block] with `this` value as its receiver. Always returns `this` value.
*
* For detailed usage information see the documentation for [scope functions](https://kotlinlang.org/docs/reference/scope-functions.html#apply).
*/
@kotlin.internal.InlineOnly
public inline fun <T> T.alsoUnless(predicate: Boolean, block: (T) -> Unit): T = if (!predicate) also(block) else this

/**
* Calls the specified function [block] with `this` value as its argument and returns its result.
*
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