Operators In JavaScript

Example

let x = 5, y = 2;

addition = x + y;
subtraction = x - y;
multiplication = x * y;
division = x / y;
console.log(addition); // 7
console.log(subtraction); // 3
console.log(multiplication); // 10
console.log(division); // 2.5

// modulus (remainder)
modulus1 = x % y; // 1
modulus2 = 7 % 5; // 2
modulus3 = 5 % 5; // 0
console.log(modulus1, modulus2, modulus3);

// increment (add 1 to the value)
x++; // 6
++y; // 3
console.log(x, y);

// decrement (subtract 1 from the value)
// x is 6 and y is 3 now
x--; // 5
--y; // 1
console.log(x, y);

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Example

// equal to
console.log(2 == 2); // true
console.log(2 == '2'); // true

// identical to
console.log(2 === 2); // true
console.log(2 === '2'); // false

// not equal to
console.log(2 != 2); // false
console.log(2 != '2'); // false

// less than
console.log(2 < 3); // true

// greater than
console.log(2 > 3); // false

// less than or equal to
console.log(2 <= 3); // true

// greater than or equal to
console.log(2 >= 3); // false

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Example

let x = 100;
console.log(x); // 100

// addition
let a = 10;
a += 10;
console.log(a); // 20

// subtraction
let b = 5;
b -= 3;
console.log(b); // 2

// multiplication
let c = 6;
c *= 2;
console.log(c); // 12

// division
let d = 15;
d /= 3;
console.log(d); // 5

// modulus
let e = 7;
e %= 3;
console.log(e); // 1

// exponent
let f = 2;
f **= 3;
console.log(f); // 8

// bitwise AND
let g = 5;
g &= 2;
console.log(g); // 0

// bitwise OR
let h = 5;
h |= 2;
console.log(h); // 7

// bitwise XOR
let i = 5;
i ^= 2;
console.log(i); // 7

// left shift
let j = 5;
j <<= 2;
console.log(j); // 20

// right shift
let k = 5;
k >>= 2;
console.log(k); // 1

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Example

// Logical AND
console.log(true && true); // true
console.log(true && false); // false
console.log(false && true); // false

// Logical OR
console.log(true || true); // true
console.log(true || false); // true
console.log(false || true); // true

// Logical NOT
console.log(!true); // false
console.log(!false); // true

// Nullish coalescing operator
let a = null;
let b = 5;
console.log(a ?? b); // return second argument, because a is null
console.log(b ?? a); // return first argument, because it is neither null nor undefined

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Example

let a = 5 & 2; // output 0
let b = 5 | 2; // 101 | 010 = 111 (output: 7)
let c = 5 ^ 2; // 101 ^ 010 = 111 (output: 7)
let d = 5 << 1; // 101 -> 1010 (output: 10)
let e = 5 >> 1; // 101 -> 010 (output: 2)
let f = 8 >>> 1; // 1000 -> 0100 (output: 4)
console.log(a, b, c, d, e, f);

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Example

let a = {};
console.log(a instanceof Object); // true
console.log(a instanceof Array); // false

let b = 25;
console.log(b instanceof Number); // true
console.log(b instanceof String); // false

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Example

let a = {};
console.log(typeof a); // object
console.log(typeof 1); // number
console.log(typeof "string"); // string

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Example

let car = {
  "name": "Ferrari",
  "year": "2016",
  "color": "red"
};
delete car.year;
console.log(car);
// { "name": "Ferrari", "color": "red" }

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Example

let car = {
  "name": "Ferrari",
  "year": "2016",
  "color": "red"
};
console.log('year' in car); // true
console.log('color' in car); // true
console.log('engine' in car); // false

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Example

let a = new Object(); // a is an object
console.log(typeof a);

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Example

let a = {
  "name": "John",
  outputName: function() {
                return this.name;
              }
};
console.log(a.outputName()); // John

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Example

let a = 1;
console.log(a ? "Yes" : "No"); // Yes

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