method alias in coffee script class - TypeError: Property is not a function

Question

method alias in coffee script class - TypeError: Property is not a function

I created a coffeeScript class with one method and its alias:

 class Class1
   method1 : (param1)=>
     console.log param1
   aliasForMethod1: @method1

 module.exports = Class1

It outputs javascript:

 // Generated by CoffeeScript 1.6.2
    (function() {
      var Class1,
        __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };

      Class1 = (function() {
        function Class1() {
          this.method1 = __bind(this.method1, this);
        }

        Class1.prototype.method1 = function(param1) {
          return console.log(param1);
        };

        Class1.prototype.aliasForMethod1 = Class1.method1;

        return Class1;

      })();

      module.exports = Class1;

    }).call(this);

Try to use this class:

 Class1 = require './class1'

 instanceOfClass1 = new Class1()

 instanceOfClass1.method1()
 instanceOfClass1.aliasForMethod1()

But got error:

$ node /pathToMyClassUser/class1_user.js
undefined

 /pathToMyClassUser/class1_user.js:11
  instanceOfClass1.aliasForMethod1();
               ^
 TypeError: Property 'aliasForMethod1' of object #<Class1> is not a function

So how to use alias for method in coffeeScript class?

node.js
coffeescript

Answer 1

It is trying to refer to a nonexistent static method on Class1 rather than its prototype. You can refer to the correct method like this (this:: or @:: is equivalent to this.prototype., but shorter - thanks mu for the tip) :

class Class1
  method1 : (param1)=>
    console.log param1
  aliasForMethod1: @::method1

Or alternatively define aliasForMethod1 as its own method that calls method1.

class Class1
  method1 : (param1)=>
    console.log param1
  aliasForMethod1: => @method1.apply(@, arguments)