JavaScript Math Object
The Math Object
The JavaScript Math object allows you to perform mathematical tasks.
The Math object is static.
All methods and properties can be used without creating a Math object first.
Math.PI;
Math Properties (Constants)
The syntax for any Math property is : Math.property.
JavaScript provides 8 mathematical constants that can be accessed as Math properties:
Example
Math.E // returns Euler's number
Math.PI // returns PI
Math.SQRT2 // returns the square root of 2
Math.SQRT1_2 // returns the square root of 1/2
Math.LN2 // returns the natural logarithm of 2
Math.LN10 // returns the natural logarithm of 10
Math.LOG2E // returns base 2 logarithm of E
Math.LOG10E // returns base 10 logarithm of E
Math Methods
The syntax for Math any methods is : Math.method(number)
Number to Integer
There are 4 common methods to round a number to an integer:
Math.round()
Math.round(x) returns the nearest integer:
Examples
Math.round(4.6);
Math.round(4.5);
Math.round(4.4);
Math.ceil()
Math.ceil(x) returns the value of x rounded up to its nearest integer:
Example
Math.ceil(4.9);
Math.ceil(4.7);
Math.ceil(4.4);
Math.ceil(4.2);
Math.ceil(-4.2);
Math.floor()
Math.floor(x) returns the value of x rounded down to its nearest integer:
Example
Math.floor(4.9);
Math.floor(4.7);
Math.floor(4.4);
Math.floor(4.2);
Math.floor(-4.2);
Math.sqrt()
Math.sqrt(x) returns the square root of x:
Example
Math.sqrt(64);
Reference
https://www.w3schools.com/js/js_math_reference.asp