Martin martin-mok

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#Lessons From A JavaScript Code Review

I was recently asked to review some code for a new JavaScript application and thought I might share some of the feedback I provided as it includes a mention of JavaScript fundamentals that are always useful to bear in mind. Code reviews are possibly the single biggest thing you can do to improve the overall quality of your solutions and if you're not actively taking advantage of them, you're possibly missing out on bugs you haven't noticed being found or suggestions for improvements that could make your code better.

##Challenges & Solutions

Code reviews go hand-in-hand with maintaining strong coding standards. That said, standards don't usually prevent logical errors or misunderstandings about the quirks of a programming language. Even the most experienced developers can make these kinds of mistakes and code reviews can greatly assist with catching them.

Often the most challenging part of code reviews is actually finding an experienced developer you trust to complete

People

`:bowtie:`	😄 `:smile:`	😆 `:laughing:`
😊 `:blush:`	😃 `:smiley:`	☺️ `:relaxed:`
😏 `:smirk:`	😍 `:heart_eyes:`	😘 `:kissing_heart:`
😚 `:kissing_closed_eyes:`	😳 `:flushed:`	😌 `:relieved:`
😆 `:satisfied:`	😁 `:grin:`	😉 `:wink:`
😜 `:stuck_out_tongue_winking_eye:`	😝 `:stuck_out_tongue_closed_eyes:`	😀 `:grinning:`
😗 `:kissing:`	😙 `:kissing_smiling_eyes:`	😛 `:stuck_out_tongue:`

Python VS ES6 syntax comparison

Python syntax here : 2.7 - online REPL

Javascript ES6 via Babel transpilation - online REPL

Imports

import math

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

	<!DOCTYPE html>
	<html>
	<head>
	<title>Array.splice Implementation</title>
	<link rel="stylesheet" type="text/css" href="http://github.com/jquery/qunit/raw/master/qunit/qunit.css" />
	<script type="text/javascript" src="http://github.com/jquery/qunit/raw/master/qunit/qunit.js"></script>
	<script type="text/javascript">
	if (!Array.prototype.splice2) {
	Array.prototype.splice2 = function(index, howmany) {
	if (index < 0) {

	'use strict';

	/***************NATIVE forEACH*******************/

	Array.prototype.myEach = function(callback) {
	for (var i = 0; i < this.length; i++)
	callback(this[i], i, this);
	};

	//tests

	const I = x => x;
	const K = x => y => x;
	const A = f => x => f(x);
	const T = x => f => f(x);
	const W = f => x => f(x)(x);
	const C = f => y => x => f(x)(y);
	const B = f => g => x => f(g(x));
	const S = f => g => x => f(x)(g(x));
	const P = f => g => x => y => f(g(x))(g(y));
	const Y = f => (g => g(g))(g => f(x => g(g)(x)));