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JavaScript Numbers

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Create a Random Number

7:27 with Guil Hernandez

JavaScript lets you create random numbers, which you can use to add variety and surprise in your programs. You generate a random number in JavaScript via a method named Math.random().

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Example Return Values

Math.floor() Return Value Math.ceil() Return Value
Math.floor() Math.ceil()
Math.floor(1.2) 1 Math.ceil(1.2) 2
Math.floor(0.0012) 0 Math.ceil(0.0012) 1
Math.floor(5.028) 5 Math.ceil(5.028) 6
Math.floor(2) 2 Math.ceil(2) 2
Math.floor(0) 0 Math.ceil(0) 0

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    You learn that JavaScript lets you create random numbers, 0:00
    which you can use to add variety and surprise in your programs. 0:03
    For example, you could program a game to randomly place enemy spaceships and 0:06
    asteroids on the screen. 0:10
    Or you can liven up your homepage by randomly selecting a photo to display each 0:12
    time someone visits your site. 0:16
    Or, randomly select a question as part of a quiz application. 0:17
    Each of these tasks starts with creating a random number. 0:22
    Generating a random number in JavaScript is quite straightforward. 0:26

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