function declaration javascript code example

Example 1: javascript function

// variable:
var num1;
var num2;
// function:
function newFunction(num1, num2){
	return num1 * num2;
}

Example 2: declare function javascript

function myFunction(var1, var2) {
  return var1 * var2;
}

Example 3: javascript function declaration

//Four ways to declare a function
function add(a, b) {
  return a + b;
}

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

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

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

Example 4: functions in javascript

function myFunction(var1, var2) {
  return var1 * var2;
}
3
How to create a function in javascriptJavascript By TechWhizKid on Apr 5 2020
function addfunc(a, b) {
  return a + b;
  // standard long function
}

addfunc = (a, b) => { return a + b; }
// cleaner faster way creating functions!

Example 5: js function

var x = 10;

function créerFonction1() {
  var x = 20;
  return new Function("return x;"); // ici |x| fait référence au |x| global
}

function créerFonction2() {
  var x = 20;
  function f() {
    return x; // ici |x| fait référence au |x| local juste avant
  }
  return f;
}

var f1 = créerFonction1();
console.log(f1());          // 10
var f2 = créerFonction2();
console.log(f2());          // 20

Example 6: function declaration javascript

//1st (simple function)
function hello1() {
    return "Hello simple function";
}

//2nd (functino expression)
hello2 = function() {
    return "Hello functino expression";
}

// 3rd ( IMMEDIATELY INVOKED FUNCTION EXPRESSIONS (llFE))
hello3 = (function() {
    return "Hello IMMEDIATELY INVOKED FUNCTION EXPRESSIONS (llFE)";
}())

//4th (arrow function)
hello4 = (name) => { return ("Hello " + name); }
    //OR
hello5 = (name) => { return (`Hello new ${name}`) }

document.getElementById("arrow").innerHTML = hello4("arrow function");

document.write("<br>" + hello5("arrow function"));