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e.mihaylinvs.LukeyLuke

LukeyLuke's Kumite #3

Code
Diff
  • String.prototype.toBase64 = function () {
  const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
  let result = '';
  let i = 0;
  while (i < this.length) {
    let a = this.charCodeAt(i++) || 0;
    let b = this.charCodeAt(i++) || 0;
    let c = this.charCodeAt(i++) || 0;

    let b1 = (a >> 2) & 0x3F;
    let b2 = ((a & 0x3) << 4) | ((b >> 4) & 0xF);
    let b3 = ((b & 0xF) << 2) | ((c >> 6) & 0x3);
    let b4 = c & 0x3F;

    if (!b) b3 = b4 = 64;
    else if (!c) b4 = 64;
    
    result += characters.charAt(b1) + 
              characters.charAt(b2) + 
              characters.charAt(b3) +
              characters.charAt(b4);
  }
  return result;
}

const hexToBase64 = hex => 
  hex
    .match(/.{1,2}/g)
    .map(v => String.fromCharCode(parseInt(v, 16)))
    .join``
    .toBase64();
    • function hexToBase64(hex) {
    • return hex;
    • String.prototype.toBase64 = function () {
    • const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
    • let result = '';
    • let i = 0;
    • while (i < this.length) {
    • let a = this.charCodeAt(i++) || 0;
    • let b = this.charCodeAt(i++) || 0;
    • let c = this.charCodeAt(i++) || 0;
    • let b1 = (a >> 2) & 0x3F;
    • let b2 = ((a & 0x3) << 4) | ((b >> 4) & 0xF);
    • let b3 = ((b & 0xF) << 2) | ((c >> 6) & 0x3);
    • let b4 = c & 0x3F;
    • if (!b) b3 = b4 = 64;
    • else if (!c) b4 = 64;
    • result += characters.charAt(b1) +
    • characters.charAt(b2) +
    • characters.charAt(b3) +
    • characters.charAt(b4);
    • }
    • return result;
    • }
    • const hexToBase64 = hex =>
    • hex
    • .match(/.{1,2}/g)
    • .map(v => String.fromCharCode(parseInt(v, 16)))
    • .join``
    • .toBase64();
e.mihaylin

Singleton in js

Construct a singleton in js.

Tests:
let obj1 = new Singleton();
let obj2 = new Singleton();
obj1.test = 1;

obj1 === obj2 // true
obj2.test // 1

let Singleton = (function () {
	let instance;

	return function Construct_singletone () {
		if (instance) {
			return instance;
		}
		if (this && this.constructor === Construct_singletone) {
			instance = this;
		} else {
			return new Construct_singletone();
		}
	}
}());
e.mihaylinvs.m_coder

Euclidean distance

Code
Diff
  • var merge = (array1, array2, callbackFN) => callbackFN(array1,array2);

callbackFN = (a,b) => Array.isArray(a) && Array.isArray(b) && a.length === b.length ?
  a.map((c, i) => c + b[i])
  : 'both inputs must be Array and same size of elements';  

var x = merge([1, 3, 4], [5, 6, 7, 8], callbackFN);
console.log(x);   //'both inputs must be Array and same size of elements'

x = merge([1, 2, 3, 4], [5, 6, 7, 8], callbackFN);
console.log(x);   //[6, 8, 10, 12].
    • var merge = function(array1, array2, callbackFN){
    • return callbackFN(array1,array2);
    • }
    • var merge = (array1, array2, callbackFN) => callbackFN(array1,array2);
    • function callbackFN(a,b) {
    • if(Array.isArray(a) && Array.isArray(b) && (a.length === b.length)){
    • return a.map(function(c,i){ return c + b[i]; });
    • } else {
    • return 'both inputs must be Array and same size of elements';
    • }
    • }
    • callbackFN = (a,b) => Array.isArray(a) && Array.isArray(b) && a.length === b.length ?
    • a.map((c, i) => c + b[i])
    • : 'both inputs must be Array and same size of elements';
    • var x = merge([1, 3, 4], [5, 6, 7, 8], callbackFN);
    • console.log(x); //x should now equal [6, 8, 10, 12].
    • console.log(x); //'both inputs must be Array and same size of elements'
    • x = merge([1, 2, 3, 4], [5, 6, 7, 8], callbackFN);
    • console.log(x); //[6, 8, 10, 12].
e.mihaylinvs.donaldsebleung

Handy Extension for Integers to Simplify &amp;quot;For&amp;quot; Loop in JS

Code
Diff
  • Number.prototype.times = function (f) {
  for (let i = 0; i < this; i++) f(i);
}
    • Number.prototype.times = function (f) {
    • for (let i = 0; i < this; i++) {
    • f(i);
    • }
    • for (let i = 0; i < this; i++) f(i);
    • }
e.mihaylinvs.donaldsebleung

Hello JS!

Code
Diff
  • let greetLanguage = (greeting = "Hello", language = "Javascript") => `${greeting}, ${language}!`;
    • function greetLanguage(greeting = "Hello", language = "Javascript") {
    • var result = `${greeting}, ${language}!`;
    • console.log(result);
    • return result;
    • }
    • let greetLanguage = (greeting = "Hello", language = "Javascript") => `${greeting}, ${language}!`;