A Short Guide on ES6 to ES5

This is a short guide to the most commonly used ES6 patterns. If you've been in the habit of using ES6 and are now required to use ES5 code in your SuiteCommerce projects, this may be a helpful guide!

Variable declarations: let and const vs var

ES6 provides block-scoped let and const for declaring variables.

let x = 10; const y = 20;

ES5 uses var, which is function-scoped.

var x = 10; var y = 20;

Arrow Functions

ES6 includes arrow functions as an alternative syntax for defining functions.

const add = (a, b) => a + b;

ES5 uses traditional function syntax.

var add = function(a, b) { return a + b; };

Template Literals

ES6 uses template literals for string interpolation with backticks.

let name = 'John'; let message = `Hello, ${name}!`;

ES5 uses string concatenation.

var name = 'John'; var message = 'Hello, ' + name + '!';

Default Parameters

ES6 introduces default parameter values in function definitions

function greet(name = 'Guest') { return `Hello, ${name}`; }

ES5 manually checks for undefined values to assign defaults.

function greet(name) { name = typeof name !== 'undefined' ? name : 'Guest'; return 'Hello, ' + name; }

Destructuring Assignment

ES6 allows destructuring to extract values from arrays or objects.

const person = {name: 'Alice', age: 30}; const {name, age} = person;

ES5 accesses values manually.

var person = {name: 'Alice', age: 30}; var name = person.name; var age = person.age;

Rest Parameters and Spread Operator

ES6 introduces rest parameters (...args) and spread (...array).

function sum(...args) { return args.reduce((a, b) => a + b, 0); } const arr = [1, 2, 3]; console.log(...arr);

ES5 uses arguments for rest and apply for spreading arrays.

function sum() { var args = Array.prototype.slice.call(arguments); return args.reduce(function(a, b) { return a + b; }, 0); } var arr = [1, 2, 3]; console.log.apply(console, arr);

Object.assign() for Cloning Objects

ES6 introduces Object.assign() for shallow-cloning objects or merging objects.

const obj1 = {a: 1, b: 2}; const obj2 = {c: 3}; const mergedObj = Object.assign({}, obj1, obj2);

ES5 uses manual methods like loops or custom functions to clone objects.

Object Property Shorthand

ES6 allows shorthand for object properties when the key matches the variable name.

const name = 'John'; const age = 25; const person = {name, age};

ES5 requires explicitly defining both key and value.

var name = 'John'; var age = 25; var person = { name: name, age: age };

Promises

ES6 provides native Promise support for handling asynchronous operations.

function getData() { return new Promise((resolve, reject) => { setTimeout(() => resolve('Data received'), 1000); }); } getData().then(result => console.log(result));

ES5 relies on callback functions for asynchronous code.

function getData(callback) { setTimeout(function() { callback('Data received'); }, 1000); } getData(function(result) { console.log(result); });

For...of Loop

ES6 introduces the for...of loop for iterating over iterable objects like arrays.

const array = [10, 20, 30]; for (let value of array) { console.log(value); }

ES5 uses a traditional for loop or the forEach method.

var array = [10, 20, 30]; for (var i = 0; i < array.length; i++) { console.log(array[i]); }

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