CSC 107 Fall 2003
Appendix E: random.js Library
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// File: random.js
// Author: Dave Reed
//
// This file contains several routines for generating random values.
// Source code is available at http://www.prenhall.com/reed/random.js
//////////////////////////////////////////////////////////////////////
function RandomNum(low, high)
// Given : low <= high
// Returns : a random number in the range [low, high)
{
return Math.random()*(high-low) + low;
}
function RandomInt(low, high)
// Given : low <= high
// Returns : a random integer in the range [low, high]
{
return Math.floor(Math.random()*(high-low+1)) + low;
}
function RandomChar(str)
// Given : str is a nonempty string
// Returns: a random character from the string
{
return str.charAt(RandomInt(0, str.length-1));
}
function RandomOneOf(list)
// Given : list is a nonempty list (array)
// Returns: a random item from the list
{
return list[RandomInt(0, list.length-1)];
}
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