JavaScript/How-JS-Works/Scoping.js at master · MrAkash33/JavaScript · GitHub

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// First scoping example

var a = 'Hello!';

first();

function first() {

var b = 'Hi!';

second();

function second() {

var c = 'Hey!';

console.log(a + b + c); // Hello!Hi!Hey!

}

}

// Example to show the differece between execution stack and scope chain

var a = 'Hello!';

first();

function first() {

var b = 'Hi!';

second();

function second() {

var c = 'Hey!';

third()

}

}

function third() {

var d = 'John';

// console.log(c); // c is not defined

console.log(a + d); // Hello!John

}