javascript - Make a function wait for another variable -

i've gone project lately requires 2 different methods 2 different variable, need store both of these values in order use them in function.

it's bit complicated, let me explain. i've got switch statement watches several numbers: 2,3,13,45

var hello; switch ($variable) {     case 2:         //do irrelevant         break;     case 3:         //do irrelevant         break;     case 13:         //do variable named "hello". ex.:         alert(hello);         break;     case 45:         hello = "hello";         break; } 

as can see, need value of "hello", before variable gets value. can't change order, nor can't change variable declaration, have setup.

what thought make function call in 13:

function getmyvariable(variable) {     var v = variable;     return variable; }  case 13:     getmyvariable(hello);     break; 

then of course function still return undefined.

what i'd do, make function wait variable set in 45:

(note speculation, code no way near working)

case 45:     hello = "hello";     getmyvariable(hello);     break;  function getmyvariable(variable) {     //function gets call case 13     //if type undefined, wait variable isn't undefined     //if variable isn't undefined return variable } 

so @ first call skip case 13, let case 45 set variable, go case 13 , execute code here. can follow me? tell me if need more info!

// needs defined somewhere outside preserved // between calls code contains `switch` var dothiswhenhelloisset = [];  // ... var hello; switch ($variable) {     // ...     case 13:                     dothiswhenhelloisset.push(function(h) {             // argument named "h"              // (which have value of variable named "hello").             // ex.:             alert(h);         });         break;     case 45:         hello = "hello";         (var = 0; < dothiswhenhelloisset.length; i++) {             dothiswhenhelloisset[i](hello);         }         dothiswhenhelloisset = [];         break; } 

note: if want store 1 next action, not need array.