Randomly choose Operator from Array

interrupt · April 9th, 2005, 06:56 AM

Hi Guys,

I have an array that looks like this:

var theoperator = new array("<<", ">>", "^", "/", "+", "*")

Then I want to pass one of the operators into a routine that looks like this:

var thenum
var theseed = (Math.random() * 1000)
var theseed2 = (Math.random() / Math.random())
thenum =theseed theoperatorhere (Math.random() * theseed2) * 100000

Where it says 'theoperatorhere' is obviously where I would like to pass the operator to, randomly chosen from the 'theoperator' array. How do I do this?

Thanks in advance
interrupt

joefawcett · April 9th, 2005, 07:19 AM

First get your "random" operator:

Code:

var arrOperators = new Array("<<", ">>", "^", "/", "+", "*");
var iRandom = Math.floor((Math.random() * arrOperators.length)); 
var sOperator = arrOperators[iRandom];

Then use eval to evaluate:

Code:

var result = eval("theseed theoperatorhere (Math.random() * theseed2) * 100000");

I don't like using eval but your alternative is just a huge switch statement.

--

Joe (Microsoft MVP - XML)

interrupt · April 9th, 2005, 07:49 AM

Hi Joe,

thanks for your help, but I get an error here according to the debugger:

var sOperator = arrOperators[iRandom];

Error: Expected ';'.