Arrays\scanR()
At a glance — Reverse running-fold. Requires materialisation of a Generator source (reverse iteration can't be lazy), but the result is re-yielded for API consistency.
Creates a Closure that emits each intermediate accumulation of a right-fold over an array or iterable, ending with the initial value.
/**
* @param callable(mixed $carry, mixed $value):mixed $function
* @param mixed $initialValue
* @return Closure(iterable<int|string, mixed>):(array<int, mixed>|\Generator<int, mixed>)
*/
Arrays\scanR(callable $function, $initialValue): ClosureReturned Closure
When Arrays\scanR() is called, it returns the following Closure which can be used like a regular function.
/**
* @param iterable<int|string, mixed> $source
* @return array<int, mixed>|\Generator<int, mixed>
*/
$function (iterable $source): array|\GeneratorExamples
Partial Application
This can be used to create a simple closure which can be used as a regular function.
$fromRight = Arrays\scanR(fn($acc, $v) => $acc . $v, '');
print_r($fromRight(['a', 'b', 'c']));
// ['cba', 'cb', 'c', '']Details
- Group: Arrays
- Subgroup: Array fold
- Since: 0.1.0
- Source:
Arrays Functions
- Arrays\append()
- Arrays\arrayCompiler()
- Arrays\arrayCompilerTyped()
- Arrays\arsort()
- Arrays\asort()
- Arrays\chunk()
- Arrays\column()
- Arrays\each()
- Arrays\filter()
- Arrays\filterAll()
- Arrays\filterAnd()
- Arrays\filterAny()
- Arrays\filterCount()
- Arrays\filterFirst()
- Arrays\filterKey()
- Arrays\filterLast()
- Arrays\filterMap()
- Arrays\filterOr()
- Arrays\flatMap()
- Arrays\flattenByN()
- Arrays\fold()
- Arrays\foldKeys()
- Arrays\foldR()
- Arrays\groupBy()
- Arrays\head()
- Arrays\krsort()
- Arrays\ksort()
- Arrays\last()
- Arrays\map()
- Arrays\mapKey()
- Arrays\mapWith()
- Arrays\mapWithKey()
- Arrays\natcasesort()
- Arrays\natsort()
- Arrays\partition()
- Arrays\pick()
- Arrays\prepend()
- Arrays\replace()
- Arrays\replaceRecursive()
- Arrays\rsort()
- Arrays\scan()
- Arrays\scanR()
- Arrays\sort()
- Arrays\sumWhere()
- Arrays\tail()
- Arrays\take()
- Arrays\takeLast()
- Arrays\takeUntil()
- Arrays\takeWhile()
- Arrays\toJson()
- Arrays\toObject()
- Arrays\toString()
- Arrays\uasort()
- Arrays\uksort()
- Arrays\usort()
- Arrays\zip()