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JavaScript

Posted by Stephen Gehring
Stephen Gehring
11,203 Points

merging constructor function json arguments into "this"?

Is there a way I can merging constructor function json arguments into "this"? 

function Rule(type, options) {

  // public properties
  this.type = type;
  this.space = 0;
  this.count = 0;
  this.length = 0;
  this.increment = 1;

  // private properties
  var _ = {}
   _.valid = false;

  // want to merge "options {}" argument into "this" to for easier code clarity & and normalize of the options passed.
  this.merge(options); // this is tossing a error

  // a public method to get for private properties 
  this.get = function(name) {
     return  _[name];
  }

  // a public method to validate the tic tac toe rule
  this.validate = function() {
     //..
  }
}

var myRule = new Rule('row', {space : 1, count: 0, length : 6, increment: 3});

2 Answers

Stephen Gehring
Stephen Gehring
11,203 Points
Stephen Gehring
Stephen Gehring
11,203 Points

Here is how I am solving this in the short term.

_.merge = function (options) {
   for (var attrname in options) { 
       this[attrname] = options[attrname]; 
    }
}
Steven Parker
Steven Parker
243,656 Points
Steven Parker
Steven Parker
243,656 Points

Why not define merge as an instance method?

Instead of "_.merge = ...", just define it as "this.merge = ...".