arrow function rec
(param1, param2, …, paramN) => { statements }
(param1, param2, …, paramN) => expression
// equivalent to: => { return expression; }
// Parentheses are optional when there's only one parameter name:
(singleParam) => { statements }
singleParam => { statements }
// The parameter list for a function with no parameters should be written with a pair of parentheses.
() => { statements }arrow function javascript
// Normal Function in JavaScript
function Welcome(){
console.log("Normal function");
}
// Arrow Function
const Welcome = () => {
console.log("Normal function");
}js arrow function
// const add = function(x,y) {
// return x + y;
// }
// const add = (x, y) => {
// return x + y;
// }
const add = (a, b) => a + b;
const square = num => {
return num * num;
}
// const rollDie = () => {
// return Math.floor(Math.random() * 6) + 1
// }
const rollDie = () => (
Math.floor(Math.random() * 6) + 1
)arrow function in javascript
//function old way
function PrintName(name){
console.log("my name is ", name) ;
}
// Arrow function es6
const PrintName = (name) => {
return console.log("my name is " , name) ;
}arrow function javascript
//If body has single statement
let myFunction = (arg1, arg2, ...argN) => expression
//for multiple statement
let myFunction = (arg1, arg2, ...argN) => {
statement(s)
}
//example
let hello = (arg1,arg2) => "Hello " + arg1 + " Welcome To "+ arg2;
console.log(hello("User","Grepper"))
//Start checking js code on chrome inspect optionjs arrow function this
const person = {
firstName: 'Viggo',
lastName: 'Mortensen',
fullName: function () {
return `${this.firstName} ${this.lastName}`
},
shoutName: function () {
setTimeout(() => {
//keyword 'this' in arrow functions refers to the value of 'this' when the function is created
console.log(this);
console.log(this.fullName())
}, 3000)
}
}Copyright © 2021 Codeinu
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