io-developer

function pairs(items) {
    return items
        .map((item, index, items) => [item, items[(index + 1) % items.length]]);
}

io-developer

function shuffle(items) {
    return items
        .map(item => [item, Math.random()])
        .sort((a, b) => (a[1] > b[1]) - (a[1] < b[1]))
        .map(item => item[0]);
}

io-developer

<?php

// create whois instance
$whois = Whois::create();

// load hosts from json
$json = json_decode(file_get_contents('your.json'), true);

// add custom servers to whois instance
$servers = $whois->getServerProvider();

io-developer

public static function calcSquareSpiralPos( outPos:Point, iteration:int, phaseShift:int=0, CCW:Boolean=false ) : void
{
  var n:int = (2.0 * Math.sqrt(iteration + 1) - 0.000001);
  var p:int = (n + phaseShift) % 4;
  var h:int = (0.5 * (1.0 + n + (p & 0x1)));
  var v:int = (0.5 * (2.0 + n - (p & 0x1)));
  var d:int = iteration - int(0.5 * ((h * (h - 1)) + (v * (v - 1))));

  outPos.x = ((2 * ((1.5 - p) & 0x1) - 1) * int(0.5 * h) + d * ((p - 1) * ((p + 1) & 0x1))) * (1 - 2 * int(CCW));
  outPos.y = ((1 - 2 * ((0.5 * p) & 0x1)) * int(0.5 * v) + d * ((p - 2) * (p & 0x1)));

io-developer

function calc(inputNum) {
    var coord = spiralCoord(inputNum - 1, -1, true);
    return Math.abs(coord.x) + Math.abs(coord.y);
}

function spiralCoord(iteration, phaseShift, isCCW) {
    var n = Math.floor(2.0 * Math.sqrt(iteration + 1) - 0.000001);
    var p = (n + phaseShift) % 4;
    var h = Math.floor(0.5 * (1.0 + n + (p & 0x1)));
    var v = Math.floor(0.5 * (2.0 + n - (p & 0x1)));

io-developer

function calc(inputNum) {
    var coord = spiralCoord(inputNum - 1);
    return Math.abs(coord.x) + Math.abs(coord.y);
}

function spiralCoord(index) {
    var coord = { x: 0, y: -1 };
    var dir = 3;
    var vecs = {
        0: { x: 1, y: 0 },

io-developer

function calc(input) {
    var checksum = 0;
    input.split('\n').forEach(row => {
        var nums = row.split('\t').map(n => parseInt(n));
        checksum += findIntDivs(nums).reduce((a, b) => a + b, 0);
    });
    return checksum;
}

function findIntDivs(nums) {

io-developer

function calc(input) {
    var checksum = 0;
    input.split('\n').forEach(row => {
        var nums = row.split('\t').map(n => parseInt(n));
        var min = nums.reduce((a, b) => Math.min(a, b));
        var max = nums.reduce((a, b) => Math.max(a, b));
        checksum += max - min;
    });
    return checksum;
}

io-developer

<?php

function generate_sets($values) {
    $total = 1 << count($values);
    for ($i = 0; $i < $total; $i++) {
        $subset = [];
        foreach ($values as $j => $val) {
            if ($i & (1 << $j)) {
                $subset[] = $val;
            }

io-developer

<?php

function sets_of($list) {
    $sets = [];
    $total = 1 << count($list);
    for ($i = 0; $i < $total; $i++) {
        $sub = [];
        foreach ($list as $j => $val) {
            if ($i & (1 << $j)) {
                $sub[] = $val;