Call a function whose name is stored in a variable [duplicate]

Answer 1

You can just invoke the function like this:

Module[str]();

Answer 2

Replace:

var init = function () {
    var str = 'fctToCall';
    Module.str(); // here
};

With:

var init = function () {
    var str = 'fctToCall';
    Module[str](); // here
};

Here, str is used as key to access the fctToCall function on Module.

Then you can call Module2.init(), in your IIFE:

(function() {
  var Module = (function() {
    var fctToCall = function() {
      document.write('Foo'); // (alert is broken in snippets)
    };
    return {
      fctToCall: fctToCall
    };
  })();
  var Module2 = (function() {
    var init = function() {
      var str = 'fctToCall';
      Module[str](); // Access & call `fctToCall`.
    };
    return {
      init: init
    };
  })();
  Module2.init(); // Call `init`.
})();

Answer 3

Since everything in JS is object you can use the object notation.

Module[str]();

Answer 4

To call function use

Module[str]();

As Module is an object, you can access the dynamic properties and methods of it by using the bracket notation.

(function() {
  var Module = (function() {
    var fctToCall = function() {
      console.log('Foo');
    };
    return {
      fctToCall: fctToCall
    };
  })();
  var Module2 = (function() {
    var init = function() {
      var str = 'fctToCall';
      
      // Call as
      Module[str]();
    };
    return {
      init: init
    };
  })();

  Module2.init();
})();