Generating a random number between two values [duplicate]

Question

I need to generate a random number from 0 to the length of my array. This is my array

var wordList = new Array["duck", "cat", "dog", "carpet", "pants", "computer", "book"];

So basically, choose one of these words. then I need to use that number to select that word and print it out. Any help?

Should be from 0 to the length of your array - 1. Arrays are zero index based... — War10ck
– War10ck, Commented Feb 19, 2014 at 17:57

Shaik Mahaboob Basha · Accepted Answer · 2014-02-19 18:00:59Z

3

Use:

wordList [ Math.floor (Math.random() * wordList.length) ]

NOTE:

The Math.random() function returns a floating-point, pseudo-random number in the range [0, 1) that is, from 0 (inclusive) up to but not including 1 (exclusive), which you can then scale to your desired range.

The Math.floor() function returns the largest integer less than or equal to a number.

edited Feb 19, 2014 at 18:00

answered Feb 19, 2014 at 17:55

Shaik Mahaboob Basha

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5 Comments

Johannes H. Over a year ago

YOu should round this. Only integers make valid array indexes.

Johannes H. Over a year ago

Ok, nevermind, you just added it ;)

danronmoon Over a year ago

You should floor this. wordlist[wordlist.length] is undefined

War10ck Over a year ago

@danronmoon or change wordList.length to wordList.length - 1.

Shaik Mahaboob Basha Over a year ago

@danronmoon thanks, I fogot to floor it

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