The JavaScript Math library

By Flavio Copes

Learn the JavaScript Math object and its constants and static functions, from Math.PI and Math.E to Math.abs(), Math.round(), and the trigonometry helpers.

The Math object contains lots of utilities math-related.

It contains constants and functions.

Constants

Functions

All those functions are static. Math cannot be instantiated.

Math.abs()

Returns the absolute value of a number

Math.abs(2.5) //2.5
Math.abs(-2.5) //2.5

Math.acos()

Returns the arccosine of the operand

The operand must be between -1 and 1

Math.acos(0.8) //0.6435011087932843

Math.asin()

Returns the arcsine of the operand

The operand must be between -1 and 1

Math.asin(0.8) //0.9272952180016123

Math.atan()

Returns the arctangent of the operand

Math.atan(30) //1.5374753309166493

Math.atan2()

Returns the arctangent of the quotient of its arguments.

Math.atan2(30, 20) //0.982793723247329

Math.ceil()

Rounds a number up

Math.ceil(2.5) //3
Math.ceil(2) //2
Math.ceil(2.1) //3
Math.ceil(2.99999) //3

Math.cos()

Return the cosine of an angle expressed in radiants

Math.cos(0) //1
Math.cos(Math.PI) //-1

Math.exp()

Return the value of Math.E multiplied per the exponent that’s passed as argument

Math.exp(1) //2.718281828459045
Math.exp(2) //7.38905609893065
Math.exp(5) //148.4131591025766

Math.floor()

Rounds a number down

Math.floor(2.5) //2
Math.floor(2) //2
Math.floor(2.1) //2
Math.floor(2.99999) //2

Math.log()

Return the base e (natural) logarithm of a number

Math.log(10) //2.302585092994046
Math.log(Math.E) //1

Math.max()

Return the highest number in the set of numbers passed

Math.max(1,2,3,4,5) //5
Math.max(1) //1

Math.min()

Return the smallest number in the set of numbers passed

Math.max(1,2,3,4,5) //1
Math.max(1) //1

Math.pow()

Return the first argument raised to the second argument

Math.pow(1, 2) //1
Math.pow(2, 1) //2
Math.pow(2, 2) //4
Math.pow(2, 4) //16

Math.random()

Returns a pseudorandom number between 0.0 and 1.0

Math.random() //0.9318168241227056
Math.random() //0.35268950194094395

Math.round()

Rounds a number to the nearest integer

Math.round(1.2) //1
Math.round(1.6) //2

Math.sin()

Calculates the sin of an angle expressed in radiants

Math.sin(0) //0
Math.sin(Math.PI) //1.2246467991473532e-16)

Math.sqrt()

Return the square root of the argument

Math.sqrt(4) //2
Math.sqrt(16) //4
Math.sqrt(5) //2.23606797749979

Math.tan()

Calculates the tangent of an angle expressed in radiants

Math.tan(0) //0
Math.tan(Math.PI) //-1.2246467991473532e-16

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