Firing named functions from an array with JavaScript?

I'm very new to JavaScript, but this topic seems to have attracted only scant forum attention. Given a number of simple functions:

function do_something(){...};
function do_somemore(){...};
function do_something_else(){...};

I was expecting to be able to assign these explicitly to cells in an (here 2D) array.

myMatrix[5][3] = do_something();
myMatrix[5][4] = do_somemore();
myMatrix[5][5] = do_something_else();

The reason I want to use such an approach are :

1. simple to understand and maintain.
2. eliminates potentially redundant anonymous function assignments in the array.

3. any given function can be assigned to multiple array cells, for example:

   myMatrix[2][6] = do_somemore();
   myMatrix[5][4] = do_somemore();
   myMatrix[6][3] = do_somemore();
   

Unfortunately, calls such as the following (based on various forum examples, plus a little "suck it and see") are all failing.

x = myMatrix[5][4]do_somemore();         -> "missing ; before statement"
x = (myMatrix[5][4])do开发者_JAVA百科_somemore();       -> "missing ; before statement"
x = (myMatrix[5][4]do_somemore)();       -> "missing ) in parenthetical"
x = (myMatrix[5][4])(do_somemore());     -> "is not a function"
x = (myMatrix[5][4])()do_somemore();     -> "missing ; before statement"
x = myMatrix[5][4]()do_somemore();       -> "missing ; before statement"
x = myMatrix[5][4]();                    -> "is not a function"
x = (myMatrix[5][4])();                  -> "is not a function"

As I have no knowledge of JavaScript internals, I'd be glad of suggestions how to get the function calls firing.

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You should assign them like this:

myMatrix[5][3] = do_something;

---

myMatrix[5][3] = do_something;

Your way would set the value to the RESULT of the function!

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I'm not entirely clear about what you are after, but:

First, before you can assign a value to an array, that array has to exist:

var myMatrix = [];
myMatrix[5] = [];
myMatrix[5][3] = … // Then you can assign something

Then, if you want to assign the return value of a function:

myMatrix[5][3] = do_something();

Or, if you want to assign the function itself:

myMatrix[5][3] = do_something;

… and then call it and assign its return value to x:

var x = myMatrix[5][3](); 

… which is the same as var x = do_something() except that inside the function this will be myMatrix[5] instead of window.

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myMatrix[5][3] = do_something; 
myMatrix[5][4] = do_somemore; 
myMatrix[5][5] = do_something_else; 


var x = myMatrix[5][3]();
var y = myMatrix[5][4]();
var z = myMatrix[5][5]();