Arrow functions: basics

Arrow functions

are shorter to write, instead of function(){} write () => {}

var func = function(){}; assert.equal('' + func, '() => {}');

instead {} use an expression, as return value

var func = () => {}; assert.equal(func(), 'I return too');

one parameter can be written without parens

var func = p => param - 1; assert.equal(func(25), 24);

many params require parens

var func = param => param + param1; assert.equal(func(23, 42), 23+42);

the function body needs parens to return an object

var func = () => {iAm: 'an object'}; assert.deepEqual(func(), {iAm: 'an object'});

Related Katas

function API

• function.length (as introduced in ES1)
• function.bind()
• function.length (with ES5 features)
• function.length (with ES6 features)
• function.name

Arrow functions

• basics
• function binding

Async Function

• basics

Difficulty Level

BEGINNER

First Published

19 March 2015

Stats

5 tests to solve