using a group of functions as a prototypes in javascript

Question

We use like

String.prototype.EndsWith = function(){ ... }

What I'm trying to do is to have several functions and be able to add them to Number, String, ... or anything else, I'm trying to find a way that has a group of functions and I can just add one prototype to an object letting it access all of these functions

Subclass String with ES2015 class syntax: class MyString extends String {/* your methods */}. Never mutate built-in prototypes. — user6445533
– user6445533, Commented Aug 9, 2016 at 13:29
basically it's not completely clear what you're trying to achieve — S Panfilov
– S Panfilov, Commented Aug 9, 2016 at 13:30

Yasin Yaqoobi · Accepted Answer · 2016-08-09 13:43:15Z

1

You can do something like this.

String.prototype.myMethods = function(){
  var self = this; 
  return {
    endsWith: function(str){
      if (self.substr(str.length).localeCompare(str) === 0){
        return true; 
      }
      return false; 
    }, 
    beginsWith: function(str){
        if (self.substr(0,str.length).localeCompare(str) === 0){
          return true;  
        }
        return false; 
     }
  };
};

var str = "String"; 

console.log(str.myMethods().endsWith("ing"));
console.log(str.myMethods().endsWith("asdf"));
console.log(str.myMethods().beginsWith("Str"));

edited Aug 9, 2016 at 13:43

answered Aug 9, 2016 at 13:36

Yasin Yaqoobi

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Community · Accepted Answer · 2017-05-23 12:14:56Z

0

According to https://stackoverflow.com/questions/16863073/dynamically-add-properties-to-the-prototype-object and some minor changes to suit my problem, this is it:

    var methods = {
        foo: function (x) { alert('foo:' + x); },
        bar: function(x){ alert('bar:'+x);}
    }
  for(var m in methods) String.prototype[m] = methods[m];

    "test".foo("aaaa");
    "test".bar("aaaa");

edited May 23, 2017 at 12:14

CommunityBot

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answered Aug 9, 2016 at 14:04

Ashkan Mobayen Khiabani

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