Online PHP editor | rfc for 3bPdm

@ 2013-07-02T16:46:22Z

<?php

// thanks to metaultralurker on reddit for inspiration
 
function map(callable $fn, \Traversable $data) {
    foreach ($data as $v) {
        yield $fn($v);
    }
}
 
function filter(callable $fn, \Traversable $data) {
    foreach ($data as $v) {
        if ($fn($v)) {
            yield $v;
        }
    }
}
 
function infinite_range() {
    $i = 0;
    while (true) {
        yield $i++;
    }
}
 
function take($n, \Traversable $data) {
    $i = 0;
    foreach ($data as $v) {
        if ($i++ === $n) {
            break;
        }
 
        yield $v;
    }
}
 
function reduce(callable $fn, \Traversable $data, $runningTotal = null) {
    $first = true;
    foreach ($data as $v) {
        if (null === $runningTotal && $first) {
            $runningTotal = $v;
            continue;
        }
        $runningTotal = $fn($runningTotal, $v);
        $first = false;
    }
 
    return $runningTotal;
}
 
$isEven = function ($x) {
    return $x % 2 == 0;
};
 
$data = take(10, map('floatval', filter($isEven, infinite_range())));
 
/*
var_dump($data->current());
$data->next();
var_dump($data->current());
$data->next();
*/
 
 var_dump(iterator_to_array($data));
 
$concat = function ($sep, $a, $b) {
    return $a.$sep.$b;
};
 
$concatComma = function ($a, $b) use ($concat) {
    return $concat(',', $a, $b);
};
 
var_dump(reduce($concatComma, $data));

Output for git.master, git.master_jit, rfc.property-hooks: array(10) { [0]=> float(0) [1]=> float(2) [2]=> float(4) [3]=> float(6) [4]=> float(8) [5]=> float(10) [6]=> float(12) [7]=> float(14) [8]=> float(16) [9]=> float(18) } Fatal error: Uncaught Exception: Cannot traverse an already closed generator in /in/3bPdm:39 Stack trace: #0 /in/3bPdm(74): reduce(Object(Closure), Object(Generator)) #1 {main} thrown in /in/3bPdm on line 39
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
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