Math Methods

Math Methods are grouped by functionality for clarity, and all operate within JavaScript’s 64-bit floating-point arithmetic, which may introduce minor precision errors (similar to Number.EPSILON considerations).

Arithmetic & Rounding Methods

These methods handle basic arithmetic and rounding operations.

abs(x)

Returns the absolute value of x.

Example:

console.log(Math.abs(-5)); // 5
console.log(Math.abs(3));  // 3

ceil(x)

Rounds x up to the nearest integer.

Example:

console.log(Math.ceil(4.1)); // 5
console.log(Math.ceil(-4.1));// -4

floor(x)

Rounds x down to the nearest integer.

Example:

console.log(Math.floor(4.9)); // 4
console.log(Math.floor(-4.9));// -5

round(x)

Rounds x to the nearest integer (half rounds up).

Example:

console.log(Math.round(4.5)); // 5
console.log(Math.round(4.4)); // 4

trunc(x)

Removes the fractional part of x, returning the integer part.

Example:

console.log(Math.trunc(4.9));  // 4
console.log(Math.trunc(-4.9)); // -4

sign(x)

Returns the sign of x:

1 → positive
1 → negative
0 → zero
0 → negative zero
NaN → not a number

Example:

console.log(Math.sign(-42)); // -1
console.log(Math.sign(0));   // 0
console.log(Math.sign(15));  // 1

fround(x)

Rounds x to the nearest 32-bit single-precision float.

Example:

console.log(Math.fround(1.337)); // 1.337000012
console.log(Math.fround(0.1 + 0.2)); // 0.30000001192092896