JavaScript: Math Operators

By Xah Lee. Date: 2022-07-28. Last updated: 2022-08-30.

Basic arithmetic.

// plus, add
console.log((3 + 4) === 7);

// minus, substraction
console.log((3 - 4) === -1);

// negation
console.log(-(3 + 4) === -7);
console.log(-(-3) === 3);

// multiply
console.log(3 * 4 === 12);

// divide
console.log(3 / 4 === 0.75);

x % y

Modular arithmetic. Get remainder of x divided by y.
Both x and y can be decimal with fraction part.

// remainder (mod)
console.log(10 % 3 === 1);

console.log(7 % 2); // 1
console.log(7.4 % 2); // 1.4000000000000004
console.log(7 % 3.4); // 0.20000000000000018

x ** n

Raise x to n's power. (JS2016) Same as Math.pow(x, n).

// power
console.log(2 ** 3 === 8);

Math.floor(x / y)

Get integer quotient. [see Math]

console.log(Math.floor(7 / 2) === 3);

Math.sqrt(x)

Square root. [see Math]

console.log(Math.sqrt(4) === 2);

Math.cbrt(x)

Cube root.

// cube root
console.log(Math.cbrt(8) === 2);

x ** (1/n)

nth root. (JS2016) Same as Math.pow(x, 1/n)

// 4th root
console.log(Math.pow(16, 1 / 4) === 2);

BUY