LearnJS/java_script_basic.js at master · SubhoBasak/LearnJS · GitHub

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// print to console
console.log("Hello World")
console.log(123)
console.log(99.99)

// comment

// this is a single line comment

/*
this is a
multi line
comment
*/

// variable declare
var x = 123
var y = 'JavaScript'
var z = 99.99

let a = 123
let b = 'JavaScript'
let c = 99.99

const m = 123
const n = 'JavaScript'
const o = 99.99


// operators
var p = 2
var q = 3
var r = null;

r = p + q;
r = p - q;
r = p * q;
r = p / q;
r = p % q;
r = p ** q;

p++;
++p;

p += 5;
p -= 5;
p *= 5;
p /= 5;
p %= 5;
p **= 5;

// some extra features of javascript
console.log('1' + 1) // output will be 2
console.log('1' + '1') // output will be '11'

// comparison
var p = '1'
var q = 1

// compare only value not type
p == '1' // true
p == 1 // true
q == '1' // true
q == 1 // true
p == q // true

// compare value and type both
p === '1' // true
p === 1 // false
q === 1 // true
q === '1' // false
p === q // false

p != '0' // true
p != 0 // true
p != q // false

p !== 1 // true
p !== q // true