JavaScript Math (Arithmetic) Object

The JavaScript Math object allows you to perform mathematical operations on numbers.

Unlike other global objects, the Math object does not have a constructor. Methods and properties are static.

All methods and properties can be used without first creating a Math object.

Math.PI

Math.PIproperty represents the ratio of the circumference of a circle to its diameter, approximately3.14159.

Math.PI;

Note: All properties and methods of the Math object are static and can be called using Math as an object without creating it.

Math.round()

This method roundsxthe value is rounded to the nearest integer.Math.round(x)

If the decimal part of the parameter is greater than 0.5then the parameter will be rounded to the integer with the next higher absolute value.

If less than 0.5then the parameter will be rounded to the integer with the lower absolute value.

If the decimal part is exactly 0.5then the parameter will be rounded along+∞rounds to the nearest integer.

Math.round(3.4);　//　　3
Math.round(3.5);　//　　4
Math.round(3.6);　//　　4
Math.round(-20.2);　　　//　-20
Math.round(-20.8);　　　//　-21

Math.pow()

This method returns the base raised to the power of the exponent, i.e., base ^exponent.Math.pow(x, y)

Math.pow(5,　3);//　125

The first parameter is the base.

The second parameter is used to raise the base to the power.

Math.sqrt()

This method returnsx'ssquare root.Math.sqrt(x)

let x = Math.sqrt(9);//　3
let y = Math.sqrt(25);　　　//　5
document.write("SQRT of　9　is: "　+　x　+　"<br>"　+　"SQRT of　25　is: "　+　y);

Math.abs()

This method returnsxthe absolute (positive) value.Math.abs(x)

Math.abs(-5);//　5

Math.ceil()

This method returnsrounding.to the next largest integer.xvalue.Math.ceil(x)

let x = Math.ceil(3.1);//　4
let y = Math.ceil(3.8);//　4
document.write(x)　+　"<br>"　+　y);

Math.floor()

This method returnsrounding.to the next smallest integer.xvalue.Math.floor(x)

let x = Math.floor(3.1);//　3
let y = Math.floor(3.8);//　3
document.write(x)　+　"<br>"　+　y);

Math.sin()

Math.sin()The method returns the sine value of the specified number.

This method returns the cosine value of the specified number.-1and1The numerical value between

Math.sin(0);　　　//　0
Math.sin(1);　　　//　0.8414709848078965
Math.sin(4);　　　//　-0.7568024953079282
Math.sin(Math.PI);　//　1.2246467991473532e-16
Math.sin(Math.PI　/　2);　//　1

Math.cos()

Math.cos()The method returns the cosine value of the specified number.

This method returns the cosine value of the specified number.-1and1The numerical value between

Math.cos(1);

Math.max() and Math.min()

Math.max()The method returns the number with the largest value in the parameter list.

Math.max(5,　2,　12,　4,　97,　26);　　　//　97

Math.min()The method returns the number with the smallest value in the parameter list.

Math.min(5,　2,　12,　4,　97,　26);　　　//　2

Math.random()

Math.random()The method returns a random number from 0 (inclusive) to1a random number (excluding).

Math.random();

You willMath.random()More information can be found in the next chapter.

Math Object Reference Manual

For a complete reference of properties and methods, please visit ourJavaScript Math Object Reference Manual.

The reference section includes descriptions and examples of all Math properties and methods.