What is the reason to do this instead of equivalent code which is also functional:

function middle(array $data) {
    return intdiv(max($data), min($data));
}

middle([2, 3, 4, 5, 6]);

Converge would be useful if you don't know which functions to apply beforehand but I can't think of such case.

Do you have a good usecase?

What is the reason to do this instead of equivalent code which is also functional:

function middle(array $data) {
    return intdiv(max($data), min($data));
}

middle([2, 3, 4, 5, 6]);

Converge would be useful if you don't know which functions to apply beforehand but I can't think of such case.

Do you have a good usecase?

<?php
// sma() function is taken from here: 
// https://github.com/markrogoyski/math-php/blob/master/src/Statistics/Average.php#L650
$sma = curry_n(2, flip('sma'));

$processingFunction = fn (...$args) => array_map(curry('implode')(' → '), $args);
$getChart = converge(
    $processingFunction,
    [$sma(1), $sma(2), $sma(4), $sma(8)]
);
// vs.
$getChart2 = function ($data) use ($sma) {
    return [
        implode(' → ', $sma(1)($data)),
        implode(' → ', $sma(2)($data)),
        implode(' → ', $sma(4)($data)),
        implode(' → ', $sma(8)($data)),
    ];
};

$chart = $getChart([1, 2, 3, 4, 5, 6, 7, 8, 9]);

Pros of converge is a more functional approach. It's easy to add another function like $sma(42) to the list of branching functions.

Awesome, thank you!