Amir Harel mrharel

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mrharel / solution.js

Last active January 14, 2019 18:30

Determine if any 3 integers in an array sum to 0. Note: The following solutions assumes that repetitions (i.e. choosing the same array element more than once) are allowed, so the array [-5,1,10] contains a zero sum (-5-5+10) and so does [0] (0+0+0). [4, 2, -1, 1, -5, 6, -4] = True

	function detectZero(arr) {
	const map = {};
	for (var i=0; i<arr.length; i++) {
	if (arr[i] === 0) return true;
	if (map[arr[i]]) return true;
	map[arr[i] * -2] = true;
	if (find2Sum(arr.slice(i), -arr[i])) return true;
	}
	return false;
	}

mrharel / proxyTrack.js

Created December 28, 2018 14:24

Using Proxy to Track Javascript Class

	const callerMap = {};

	function getCaller(error) {
	if (error && error.stack) {
	const lines = error.stack.split('\n');
	if (lines.length > 2) {
	let match = lines[2].match(/at ([a-zA-Z\-_$.]+) (.*)/);
	if (match) {
	return {
	name: match[1].replace(/^Proxy\./, ''),

mrharel / palindrome.js

Created November 8, 2018 12:32

Palindromes in JavaScript


	const word = "A man, a plan, a canal. Panama";

	/*
	* Checks if a string is a palindrome (as explained here: https://medium.freecodecamp.org/two-ways-to-check-for-palindromes-in-javascript-64fea8191fd7
	* hard polindrome will not except string with white space.
	*/
	const palindrome = (w, hard = false) => {
	const str = hard ? w : w.toLowerCase().replace(/[^a-zA-Z0-9]/g,"");
	const left = str.substring(0, Math.floor(str.length/2));

mrharel / file-resize.js

Last active September 27, 2017 06:32

Resize and flip the file (using the exif lib) if needed

	import EXIF from "exif-js";

	const DEFAULT_MAX_SIZE = 1600;
	const JPEG_QUALITY = 0.9;
	const FILE_READER_STATE_DONE = 2;
	const JPEG_FILETYPE = "image/jpeg";
	/**
	* Set up operations and degrees to rotate for each EXIF orientation (index).
	*/
	const ExifOrientations = [