JavaScript Math Object

The built-in Math object includes mathematical constants and functions.

Examples

Round
How to round a specified number to the nearest whole number

Random number
The random method returns a random number between 0 and 1

Random number from 0 to 9
How to find a random number from 0 to 9 using the random method.

Max number
How to test which of two numbers, has the higher value.

Min number
How to test which of two numbers, has the lower value.

The Math object

The built-in Math object includes mathematical constants and functions. You do not need to create the Math object before using it.

To store a random number between 0 and 1 in a variable called "r_number":

r_number=Math.random()

To store the rounded number of 8.6 in a variable called "r_number":

r_number=Math.round(8.6)

The Math object's properties and methods are described below:

NN: Netscape, IE: Internet Explorer, ECMA: Web Standard

Properties	Explanation	NN	IE	ECMA
E	Returns the base of a natural logarithm	2.0	3.0	1.0
LN2	Returns the natural logarithm of 2	2.0	3.0	1.0
LN10	Returns the natural logarithm of 10	2.0	3.0	1.0
LOG2E	Returns the base-2 logarithm of E	2.0	3.0	1.0
LOG10E	Returns the base-10 logarithm of E	2.0	3.0	1.0
PI	Returns PI	2.0	3.0	1.0
SQRT1_2	Returns 1 divided by the square root of 2	2.0	3.0	1.0
SQRT2	Returns the square root of 2	2.0	3.0	1.0

Methods	Explanation	NN	IE	ECMA
abs(x)	Returns the absolute value of x	2.0	3.0	1.0
acos(x)	Returns the arccosine of x	2.0	3.0	1.0
asin(x)	Returns the arcsine of x	2.0	3.0	1.0
atan(x)	Returns the arctangent of x	2.0	3.0	1.0
atan2(x,y)	Returns the angle from the x axis to a point	2.0	3.0	1.0
ceil(x)	Returns the nearest integer greater than or equal to x	2.0	3.0	1.0
cos(x)	Returns the cosine of x	2.0	3.0	1.0
exp(x)	Returns the value of E raised to the power of x	2.0	3.0	1.0
floor(x)	Returns the nearest integer less than or equal to x	2.0	3.0	1.0
log(x)	Returns the natural log of x	2.0	3.0	1.0
max(x,y)	Returns the number with the highest value of x and y	2.0	3.0	1.0
min(x,y)	Returns the number with the lowest value of x and y	2.0	3.0	1.0
pow(x,y)	Returns the value of the number x raised to the power of y	2.0	3.0	1.0
random()	Returns a random number between 0 and 1	2.0	3.0	1.0
round(x)	Rounds x to the nearest integer	2.0	3.0	1.0
sin(x)	Returns the sine of x	2.0	3.0	1.0
sqrt(x)	Returns the square root of x	2.0	3.0	1.0
tan(x)	Returns the tangent of x	2.0	3.0	1.0

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