How to make a for loop that will go through functions without going through the same one twice

Question

I have some functions, like:

function functionOne() {
    /*
    code
    */
}
function functionTwo() {
    /*
    code
    */
}
function functionThree() {
    /*
    code
    */
}

How can I write code to call each of the functions, once each (i.e. without repeats), in a random order?

Answer 1

Put your functions in an array, randomise the array and then iterate through it:

var functions = [
function () {  alert("function 0");  },
function () {  alert("function 1");  },
function () {  alert("function 2");  },
function () {  alert("function 3");  },
function () {  alert("function 4");  }
    ];

functions.sort(function() { return 0.5 - Math.random() });

for (var i=0;i<5;i++) {
    console.log(i);
    functions[i]();
}

Here's a fiddle