Unique Random Numbers
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// Unique Random Numbers
// -Picks a number of unique random numbers from an array
// (c) 2002 Premshree Pillai
// http://www.qiksearch.com
// http://premshree.resource-locator.com
// E-mail : qiksearch@rediffmail.com
function pickNums(nums, numArr)
{
if(nums>numArr.length)
{
alert('You are trying to pick more elements from the array than it has!');
return false;
}
var pickArr=new Array();
var tempArr=numArr;
for(var i=0; i
pickArr[pickArr.length]=tempArr[Math.round((tempArr.length-1)*Math.random())];
var temp=pickArr[pickArr.length-1];
for(var j=0; j
if(tempArr[j]==temp)
{
tempArr[j]=null;
var tempArr2=new Array();
for(var k=0; k
tempArr2[tempArr2.length]=tempArr[k];
tempArr=tempArr2;
break;
}
}
}
return pickArr;
}
Unique Random Numbers
This JavaScript picks up a number of unique random elements from an array.
For example; if you have an array myArray consisting of 10 elements and want to pick 5 unique random elements. Suppose initially myArray[3] is picked randomly, then myArray[3] should not be picked again.
If you want to pick 4 numbers, call the function like this :
pickNums(4,myArray). This function will return an array consisting of 4 unique random numbers. Thus you can store this array like this :
var anotherArray=pickNums(4,myArray).
You can now use this array for displaying the elements in different formats.
Could be useful :-)
Here's an example :
/* Add elements to this array */
var myArr = new Array("1","2","3","4","5","6","7","8","9");
var outArr=pickNums(5, myArr); /* Store the output */
/* Print Output */
/* Modify this part to suit your output needs */
document.write('');
for(var i=0; i
document.write('' + outArr[i] + ' ');
}
document.write('');
Reload the page to see a set of another unique random numbers.
© 2002 Premshree Pillai.