Dynamically call javascript function based on function arguments

Question

I have a jQuery function which accepts few arguments based on the argument I should call another jQuery function.

example:

arg0 = "Launch"
 arg1 = "menu"

example:

(function($)
 {
 preRender: function(arg0,arg1)
 {
 var nextFuncName = arg0+arg1; //launchmenu
 nextFuncName() // hope to call the function name framed from the number of arguments
 }
})(jQuery);
 (function($)
 {
 launchmenu: function()
 {
 console.log("Launchmenu called");
 }
})(jQuery);

I referred the following link calling a jQuery function named in a variable but I don't want to use eval() or window object.

Is it possible to use $.proxy or any other method to achieve this functionality, also is it possible to achieve this using underscore.js?

Any help will be appreciated.

• Roamer-1888: You can only do this if the full set of possible functions is defined as properties of some object, myObject. Then you can write myObject[arg0 + arg1]().
• Julian Gonggrijp: Why is each of your functions defined in a separate immediately-invoked function expression (IIFE) that takes jQuery as an argument? And by a "jQuery function" do you mean such a function defined inside an IIFE, or do you actually mean a method of the jQuery library?

Answer 1

Try utilizing jQuery object

...or much better an own, local object, instead of polluting the global jQuery namespace.

---

Merge them so that you use localObject for launchmenu but $ for preRender

---

(function($) {
 var localObject = {};
 function launchmenu() {
 console.log("Launchmenu called")
 }
 function preRender(arg0, arg1) {
 var nextFuncName = arg0 + arg1;
 if (nextFuncName in localObject) {
 localObject[nextFuncName]()
 } else {
 console.log(typeof nextFuncName)
 }
 }
 localObject.launchmenu = launchmenu;
 $.preRender = preRender;
 
}(jQuery));
$(function() {
 $.preRender("launch", "menu");
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js">
</script>

• Bergi: ...or much better an own, local object, instead of polluting the global jQuery namespace.
• Bergi: Well there was nothing wrong with exporting preRender to $, only all those dynamically-named function should stay inside the IIFE.
• guest271314: @Bergi When defining outside IIFE , as named function , attempt is to preserve ability to utilize outside of "local object" , or jQuery - though would change the $ within if condition to this , so call, apply could be utilized ; without redefining $ before, when called. Not certain interpreting "only all those dynamically-named function should stay inside the IIFE." portion correctly ? Can describe details ?
• guest271314: @Bergi What could be improved at above solutions ?
• Bergi: Just what I said: Merge them so that you use localObject for launchmenu but $ for preRender .