Online PHP editor | rfc for MHFiE

@ 2014-10-26T16:16:44Z

<?php

/*
span                    :: (a -> Bool) -> [a] -> ([a],[a])
span _ xs@[]            =  (xs, xs)
span p xs@(x:xs')
         | p x          =  let (ys,zs) = span p xs' in (x:ys,zs)
         | otherwise    =  ([],xs)
*/
function span($p, $xs) {
    if (empty($xs)) {
        return [[], []];
    }

    $xs_ = $xs;
    $x = array_shift($xs_);

    if ($p($x)) {
        list($ys, $zs) = span($p, $xs_);

        return [array_unshift($ys, $x), $zs];
    }

    return [[], $xs];
}

/*
groupBy                 :: (a -> a -> Bool) -> [a] -> [[a]]
groupBy _  []           =  []
groupBy eq (x:xs)       =  (x:ys) : groupBy eq zs
                           where (ys,zs) = span (eq x) xs
*/
function array_group(callable $eq, array $xs) {
    if (empty($xs)) {
        return [];
    }

    $x = array_shift($xs);

    list($ys, $zs) = span($eq($x), $xs);
}

function it($m,$p){echo ($p?'✔︎':'✘')." It $m\n"; if(!$p){$GLOBALS['f']=1;}}function done(){if(@$GLOBALS['f'])die(1);}

it('spans elements', span(function ($x) { return $x < 2; }, [1, 2, 3]) === [[1, 2], [3]]);

Output for git.master, git.master_jit, rfc.property-hooks: ✘ It spans elements

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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