JavaScript: Calling functions from an Array

Question

I have followed the answer to a previous question but I am not getting the results. I am generating a random number and based on the number, I want to call 1 of four functions:

var functionArray[single, double, triple, quadruple];
function main() {
 ranNum = Math.floor(Math.random() * functionArray.length);
 x = functionArray[ranNum](); /* is this the way to call the function? */
}
/* example of one function in the array */
function single() {
 /* do stuff */
 return x;
}

• Rajaprabhu Aravindasamy: what is your problem here with the code
• Md Johirul Islam: var functionArray=[single, double, triple, quadruple]

Answer 1

You are initializing the array wrong:

var functionArray[single, double, triple, quadruple];

Should be:

var functionArray = [single, double, triple, quadruple];

Then it should work!

---

x = functionArray[ranNum](); 

is this the way to call the function?

Yes, you can call it this way. But it might be more clear if you just execute Function.prototype.call:

x = functionArray[ranNum].call();

---

Also note that you are using reserved words, like double. You are better off avoiding these.

• Struggle with Andres: Very much appreciated!
• Tim: @StrugglewithAndres You can accept this answer if it fits your needs! :)