arrow function in javascript code example

Example 1: arrow function javascript

// Normal Function in JavaScript
function Welcome(){
  console.log("Normal function");
}

// Arrow Function
const Welcome = () => {
  console.log("Normal function");
}

Example 2: javascript arrow function

// Non Arrow (standard way)
let add = function(x,y) {
  return x + y;
}
console.log(add(10,20)); // 30

// Arrow style
let add = (x,y) => x + y;
console.log(add(10,20)); // 30;

// You can still encapsulate
let add = (x, y) => { return x + y; };

Example 3: 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
)

Example 4: es6 arrow function

const multiplyES6 = (x, y) => x * y;

Example 5: js 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)
    }
}

Example 6: 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) ;
}