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Fix values being at root and local level
Resolves #278
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,30 +1,27 @@ | ||
| package utils | ||
|
|
||
| /** | ||
| * Returns the default value if the values returned by the [selector] function on each element | ||
| * in this iterable are all the same. Otherwise, returns `null`. | ||
| * Transforms each element of the iterable using the provided [selector] function, collects the transformed elements | ||
| * into a set, and then evaluates whether there is a single distinct element in the set. If there's only one distinct | ||
| * element, returns `null`; otherwise, returns the specified [default] value. | ||
| * | ||
| * @param default the value to return if the elements are not distinct | ||
| * @param selector a function that maps elements to a value to be compared for distinctness | ||
| * @return the default value if the elements are not distinct, `null` otherwise | ||
| * @param default the default value to return if there is more than one distinct element. | ||
| * @param selector the function to transform elements. | ||
| * @return `null` if there is a single distinct element; otherwise, the [default] value. | ||
| */ | ||
| inline fun <T, R> Iterable<T>.takeIfNotDistinct(default: R, selector: (T) -> R): R? { | ||
| return if (any()) { | ||
| if (distinctBy(selector).size == 1) null else default | ||
| } else { | ||
| null | ||
| } | ||
| inline fun <T, R> Iterable<T>.filterSingleDistinctOrElse(default: R, selector: (T) -> R): R? { | ||
| return if (mapTo(HashSet(), selector).size == 1) null else default | ||
| } | ||
|
|
||
| /** | ||
| * Returns a distinct value of type [R] obtained by applying the given [selector] function to each element of the | ||
| * iterable, or null if there are multiple distinct values or if there are no values after applying the [selector]. | ||
| * Maps each element of the iterable using the provided [selector] function, collects the transformed elements into a | ||
| * set, and then returns a single distinct element from the set, or null if the set is empty or contains more than one | ||
| * element. | ||
| * | ||
| * @param selector a function that maps an element of the iterable to a value of type [R] or returns null if the | ||
| * element should be skipped. | ||
| * @return a distinct value of type [R] or null if there are multiple distinct values or if there are no values | ||
| * after applying the [selector]. | ||
| * @param selector the function to transform elements. | ||
| * @return a single distinct element from the transformed set, or null if the set is empty or contains more than one | ||
| * element. | ||
| */ | ||
| inline fun <T, R> Iterable<T>.getDistinctOrNull(selector: (T) -> R?): R? { | ||
| return mapNotNull(selector).toSet().singleOrNull() | ||
| inline fun <T, R> Iterable<T>.mapDistinctSingleOrNull(selector: (T) -> R): R? { | ||
| return mapTo(HashSet(), selector).singleOrNull() | ||
| } |
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