Math | Tutorial | Webucator

Math

The Math object is a built-in static object. The Math object's properties and methods are accessed directly (e.g., Math.PI) and are used for performing complex math operations. Some common math properties and methods are shown below:

Common Math Properties
Property	Description
`Math.PI`	The value of Pi ()
`Math.PI`	Math.PI; //3.141592653589793
`Math.SQRT2`	Square root of 2.
`Math.SQRT2`	Math.SQRT2; //1.4142135623730951

Common Math Methods
Method	Description
`Math.abs(number)`	Absolute value of `number`.
`Math.abs(number)`	Math.abs(-12); //Returns 12
`Math.ceil(number)`	`number` rounded up.
`Math.ceil(number)`	Math.ceil(5.4); //Returns 6
`Math.floor(number)`	`number` rounded down.
`Math.floor(number)`	Math.floor(5.6); //Returns 5
`Math.max(numbers)`	Highest Number in `numbers`.
`Math.max(numbers)`	Math.max(2, 5, 9, 3); //Returns 9
`Math.min(numbers)`	Lowest Number in `numbers`.
`Math.min(numbers)`	Math.min(2, 5, 9, 3); //Returns 2
`Math.pow(number, power)`	`number` to the power of `power`.
`Math.pow(number, power)`	Math.pow(2, 5); //Returns 32
`Math.round(number)`	Rounded `number`.
`Math.round(number)`	Math.round(2.5); //Returns 3
`Math.random()`	Random number between 0 and 1.
`Math.random()`	Math.random(); //Returns random //number from 0 to 1

You can see these examples in a browser by opening BuiltInObjects/Demos/MathPropertiesAndMethods.html.

Method for Generating Random Integers

Because Math.random() returns a decimal value greater than or equal to 0 and less than 1, we can use the following code to return a random integer between low and high, inclusively:

var low = 1;
var high = 10;
var rndDec = Math.random();
var rndInt = Math.floor(rndDec * (high - low + 1) + low);