Difference between object and object.prototype in Javascript -


this question has answer here:

ok here's bit of code working atm.

my problem don't difference between object , object prototype. until thought, if make new object, e.g. new memory, inherits properties declared in memory. in code, however, need add options memory.prototype.

so core question is: difference between properties of object , properties of object.prototype?

edit: specify: in memory function log this.options. doesn't work, unless include memory.prototype.options = {...}. if new memory inherits properties memory , defined e.g this.options.availablecards above, why need add options prototype?

var creatememory = function (){         new memory( {wrapperid: 'memory-game'} );       };        var memory = function (options) {         //check required options         if ((options.wrapperid === undefined)){           console.error('error: not required options given. wrapperid required!');           return false;         }          //hardcoded values         this.options.availablecards = 22;         this.options.cols = 4;         this.options.rows = 4;         this.options.fliptime = this.options.fliptime || 1; //set default         this.options = extend({}, this.options);         extend(this.options, options);         //this._init();         console.log(this.options);        };         // why required?        memory.prototype.options = {          ongameend: function(){            return false;          }        };         creatememory();

you forgot return new object in creatememory.

a few other fixes , had invent extend function, since didn't include yours.

//extend function  function extend(a, b) {      (var in b) {        if (b.hasownproperty(i)) {          a[i] = b[i];        }      }      return a;    }    //memory class    function memory(options) {    //check required options    if ((options.wrapperid === undefined)) {      console.error('error: not requried options given. wrapperid requried!');      return false;    } // hardcoded values      this.options.availablecards = 22;    this.options.cols = 4;    this.options.rows = 4;    this.options.fliptime = this.options.fliptime || 1;    this.options = extend({}, this.options);    extend(this.options, options);    //this._init();  };  memory.prototype.options = {    ongameend: function() {      alert("inherited")    }  };  //instantiater  function creatememory() {    return new memory({      wrapperid: 'memory-game'    });  };    //instantiate  var m = new creatememory();  //call inherited  console.log(m);  m.options.ongameend();

properties of object specific instance of object, while properties of prototype shared among instances of object.

if, instance, have id number each instance, id property needs on object since unique instance.

conversely, if had method exact same of instances, can save on memory putting in prototype , inherit it.


Comments

Post a Comment

Popular posts from this blog

asynchronous - C# WinSCP .NET assembly: How to upload multiple files asynchronously -

i using winscp .net assembly uploading files. want upload multiple files asynchronous way. have created method works single upload. public class uploadingdata { private sessionoptions _sessionoptions; private session _session; //connection etc private void onconnected() { foreach (var fileinfo in localfileslist) { var task = task.factory.startnew(() => uploadfilesasync(fileinfo)); } } private async task uploadfilesasync(string file) { string remotefilepath = _session.translatelocalpathtoremote(file, @"/", "/test_data_upload"); var uploading = _session.putfiles(file, remotefilepath, false); //when done await task.run(() => thread.sleep(1000)); } } please suggest me correct way. thanks you can use backgroundworker class this: string[] images = new string[50]; foreach (var path in images) { backgroundworker
Read more

aws api gateway - SerializationException in posting new Records via Dynamodb Proxy Service in API -

i getting "__type": "com.amazon.coral.service#serializationexception" as reply in postman & in test console in api gateway trying post record directly dynamodb using api proxy services.. referring aws article - https://aws.amazon.com/blogs/compute/using-amazon-api-gateway-as-a-proxy-for-dynamodb/ here's mapping { "tablename": "tablenamegoeshere", "item": { "id" : "$context.requestid" "eventname" : "$input.path('$.eventname')", "timestamp" : $input.path('$.timestamp'), "answers": "$util.parsejson($input.path('$.answers'))" } } update: did asked ... , worked if try add array of json objects gives me above same error - here's trying now. please - couldnt find on google well #set($inputroot = $input.path('$')) { "tablename": "answer", "item": {
Read more

asp.net - Problems sending emails from forum -

i have been redesigning site has message board, has been written guy looked after site. it has few problems , written in .asp , uses .mdb files database. you can see whole thing here . feel free post if helps, test thing have set using original files , new database. the basic problem when posts message, supposed email sent them, have posted it. when replies, originator supposed message, replier has been posted. i’d have thought @ point in process there should script/file in postmessage.asp? the postmessage.asp page below. <% option explicit %> <!-- #include virtual="common/adovbs.inc" --> <html> <head> <meta http-equiv="content-type" content="text/html; charset=windows-1252"> <meta name="generator" content="microsoft frontpage 4.0"> <meta name="progid" content="frontpage.editor.document"> <title>new page 2</title> <base target="_self"
Read more