Question

I am using something like this:
alert("Random number is: "+ Math.floor(Math.random() * 75) + 0);.
To create a random number between 0 and 75. Any idea how I can create a random number between 0 and 75 that IS NOT one of the numbers in this comma-parsed string:
$not_these_numbers = "17,26,52,75";.

Answer 1

Generate array of numbers (0-75, excluding those numbers) then generate random index:

var exclude = "17,26,52,75".split(',');
var numbers = [];

for (var i = 0; i <= 75; i++) {
    if (exclude.indexOf(i+'') == -1)
        numbers.push(i);
}

// will never be one of the numbers in exclude array
var random_number = numbers[Math.floor(Math.random() * numbers.length)];