node.js - binding values while looping in constructor CoffeeScript -

i have decided use coffeescript , have been trying convert node.js module of mine coffeescript. so, here code in js:

function domain(obj){     var self = this;     (var key in obj){         this[key] = obj[key]; //merge values     } }  domain.prototype.save = function(fn){  } 

and attempt have same in coffeescript following:

class domain   consructor: (obj) ->     own key, value of obj       @key = value    save: (fn) ->  module.exports  = domain 

the following test fails:

require('coffee-script'); var should = require('should')     , domain = require('../index');  should.exist(domain);  var domain = new domain({'attone':1, 'atttwo':2});  domain.should.have.property('save'); domain.should.have.property('attone'); domain.should.have.property('atttwo');  domain.save.should.be.an.instanceof(function);  console.log('all tests passed'); 

the property 'attrone' , 'attrtwo' not binding domain class. have compiled coffee code 'coffee -c index.coffee' see js code:

(function() {   var domain,     __hasprop = {}.hasownproperty;    domain = (function() {     function domain() {}      domain.prototype.consructor = function(obj) {       var key, value, _results;        _results = [];       (key in obj) {         if (!__hasprop.call(obj, key)) continue;         value = obj[key];         _results.push(this.key = value);       }       return _results;     };      domain.prototype.save = function(fn) {};      return domain;    })();    module.exports = domain;  }).call(this); 

from compiled js, see '_result' array being generated , returned never binded 'this'. how bind array class scope pass test?thank you

your line of coffeescript

@key = value 

is not equivalent javascript want

this[key] = obj[key]; 

the way @ works is replaced either this or this.. thus, @key compiles this.key. should instead use

@[key] = value 

additionally, spelled constructor wrong (as consructor). in coffeescript, constructor special method compiles differently normal method; if spelled wrong, coffeescript assumes want empty one.