PixelPiggy/CS_float

1const https = require('https'),2    fs = require('fs');3 4/*5    Downloads the given HTTPS file6*/7exports.downloadFile = function(url, cb) {8    https.get(url, function(res) {9        let errored = false;10 11        if (res.statusCode !== 200 && !errored) {12            cb();13            return;14        }15 16        res.setEncoding('utf8');17        let data = '';18 19        res.on('error', function(err) {20            cb();21            errored = true;22        });23 24        res.on('data', function(chunk) {25            data += chunk;26        });27 28        res.on('end', function() {29            cb(data);30        });31    });32};33 34/*35    Returns a boolean as to whether the specified path is a directory and exists36*/37exports.isValidDir = function(path) {38    try {39        return fs.statSync(path).isDirectory();40    } catch (e) {41        return false;42    }43};44 45/*46    Returns a boolean as to whether the string only contains numbers47*/48exports.isOnlyDigits = function (num) {49    return /^\d+$/.test(num);50};51 52/*53    Filters the keys in the given object and returns new one54*/55exports.filterKeys = function (keys, obj) {56    return keys.reduce((result, key) => {57        if (key in obj) result[key] = obj[key];58        return result;59    }, {});60};61 62/*63    Removes keys with null values64 */65exports.removeNullValues = function (obj) {66    return Object.keys(obj).reduce((result, key) => {67        if (key in obj && obj[key] !== null) {68            result[key] = obj[key];69        }70 71        return result;72    }, {});73};74 75/*76    Converts the given unsigned 64 bit integer into a signed 64 bit integer77 */78exports.unsigned64ToSigned = function (num) {79    const mask = 1n << 63n;80    return (BigInt(num)^mask) - mask;81};82 83/*84    Converts the given signed 64 bit integer into an unsigned 64 bit integer85 */86exports.signed64ToUnsigned = function (num) {87    const mask = 1n << 63n;88    return (BigInt(num)+mask) ^ mask;89};90 91/*92    Checks whether the given ID is a SteamID6493 */94exports.isSteamId64 = function (id) {95    id = BigInt(id);96    const universe = id >> 56n;97    if (universe > 5n) return false;98 99    const instance = (id >> 32n) & (1n << 20n)-1n;100 101    // There are currently no documented instances above 4, but this is for good measure102    return instance <= 32n;103};104 105/*106    Chunks array into sub-arrays of the given size107 */108exports.chunkArray = function (arr, size) {109    return new Array(Math.ceil(arr.length / size)).fill().map(_ => arr.splice(0,size));110};111 112/*113    Shuffle array - O(N LOG N) so it shouldn't be used for super-large arrays114 */115exports.shuffleArray = function (arr) {116    return arr.map(value => ({ value, sort: Math.random() }))117        .sort((a, b) => a.sort - b.sort)118        .map(({ value }) => value)119}120 121