What is an arrow function in JavaScript code example

Example 1: 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 2: es6 arrow function

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

Example 3: () = javascript

//Normal function
function sum(a, b) {
  return a + b;
}

//Arraw function
let sum = (a, b) => a + b;

Example 4: 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 option

Example 5: javascript this inside arrow function

function A() {
  this.val = "Error";
  (function() {
    this.val = "Success";
  })();
}

function B() {
  this.val = "Error";
  (() => {
    this.val = "Success";
  })();
}

var a = new A();
var b = new B();
a.val // "Error"
b.val // "Success"

Example 6: arrow function javascript

// Traditional Function
function (a){
  return a + 100;
}

// Arrow Function Break Down

// 1. Remove the word "function" and place arrow between the argument and opening body bracket
(a) => {
  return a + 100;
}

// 2. Remove the body brackets and word "return" -- the return is implied.
(a) => a + 100;

// 3. Remove the argument parentheses
a => a + 100;