marrek13

<?php

function fold($array, $callback, $initial=null)
{
    $acc = $initial;
    foreach($array as $a)
        $acc = $callback($acc, $a);
    return $acc;
}

marrek13

fun <T, R> Collection<T>.fold(
    initial: R,
    combine: (acc: R, nextElement: T) -> R
): R {
    var accumulator: R = initial
    for (element: T in this) {
        accumulator = combine(accumulator, element)
    }
    return accumulator
}

marrek13

fun main() {
    //ARRAYS
    val array = arrayOf(1,2,3,4,5,6)

    // array size is just a property not another function
    val arrayLength = array.size

    // methods are chained and lambda function can be used
    val multipliedArrayReversed = array.map { it * 2 }.reversed()

marrek13

<?php

// ARRAYS
$array = [1,2,3,4,5,6];

// we need to use count function to get array length
$arrayLength = count($array);

// we need to combine 2 functions to get reversed array with elements multiplied by 2
$multipliedArrayReversed = array_reverse(array_map(fn(int $value): int => $value * 2, $array));