arguments.js

function accessArguments () {
  console.log(arguments[0]);
}

accessArguments(1, 2); // this will log 1

convertObject.js

var args = Array.prototype.slice.call(arguments);
args.slice(1, 2); // not you can use args as normal array

equalityCheck.js

console.log(1 == '1'); // this will log true

IIFE.js

var x = (function IIFE(){
  return 'Hello I am IIFE';
})();

console.log(x) // will log Hello I am IIFE

IIFEArguments.js

var x = (function IIFE(){
  return arguments[0];
})(1);

console.log(x) // will log 1

instanceof.js

var arr = ['one', 'two', 'three', 'four', 'five', 'six'];
arr instanceof Array

looseEqualityCheck.js

console.log(1 === '1'); // this will log false

mergeObjects.js

function merge () {
	var args = Array.prototype.slice.call(arguments);
	var obj = {};
	for( var i = 0; i < args.length; i++ ) {
		if(args[i] instanceof Object) {
			for( var prop in args[i] ) {
				obj[prop] = args[i][prop] // we append new object property and if any property exist overwrite it
			}
		} else {
			console.error('you provided a non object at : ', i);
		}
	}
	
	return obj;
}

var obj = merge( { x: 1 }, { y: 2 }, { x: 3 , y: 4} ) // will output  {x: 3, y: 4}

optionalAssignment.js

function accessArguments () {
  var x = arguments[1] || 2;
  console.log(x);
}

accessArguments(1); // this will log 2
accessArguments(1, 3); // this will log 3

ternary.js

var x = 20;
var pass = x > 10 ? true : false
var Hurray = pass ? true : false

typeof.js

typeof x === 'undefined' // will return true
var x = 1;
typeof x === 'undefined' // will return false
typeof x === 'number' // will return true