Truffle Pet Shop understanding App.js code












-1















I'm looking at the following code (link):



App = {

web3Proverder: null,
contracts: {},

...

initContracts: function(){
$.getJSON('Greeter.json', function(data) {
var GreeterArtifact = data;
App.contracts.Greeter = TruffleContract(GreeterArtifact)
App.contracts.Greeter.setProvider(App.web3Provider)
});
},

...
}


It seems contracts starts as an empty object, and then App.contracts.Greeter is set equal to something. How is it that the contracts object has a Greeter attribute if Greeter is not defined anywhere in app.js.



Can somehow help explain this so I can better understand the code?










share|improve this question





























    -1















    I'm looking at the following code (link):



    App = {

    web3Proverder: null,
    contracts: {},

    ...

    initContracts: function(){
    $.getJSON('Greeter.json', function(data) {
    var GreeterArtifact = data;
    App.contracts.Greeter = TruffleContract(GreeterArtifact)
    App.contracts.Greeter.setProvider(App.web3Provider)
    });
    },

    ...
    }


    It seems contracts starts as an empty object, and then App.contracts.Greeter is set equal to something. How is it that the contracts object has a Greeter attribute if Greeter is not defined anywhere in app.js.



    Can somehow help explain this so I can better understand the code?










    share|improve this question



























      -1












      -1








      -1








      I'm looking at the following code (link):



      App = {

      web3Proverder: null,
      contracts: {},

      ...

      initContracts: function(){
      $.getJSON('Greeter.json', function(data) {
      var GreeterArtifact = data;
      App.contracts.Greeter = TruffleContract(GreeterArtifact)
      App.contracts.Greeter.setProvider(App.web3Provider)
      });
      },

      ...
      }


      It seems contracts starts as an empty object, and then App.contracts.Greeter is set equal to something. How is it that the contracts object has a Greeter attribute if Greeter is not defined anywhere in app.js.



      Can somehow help explain this so I can better understand the code?










      share|improve this question
















      I'm looking at the following code (link):



      App = {

      web3Proverder: null,
      contracts: {},

      ...

      initContracts: function(){
      $.getJSON('Greeter.json', function(data) {
      var GreeterArtifact = data;
      App.contracts.Greeter = TruffleContract(GreeterArtifact)
      App.contracts.Greeter.setProvider(App.web3Provider)
      });
      },

      ...
      }


      It seems contracts starts as an empty object, and then App.contracts.Greeter is set equal to something. How is it that the contracts object has a Greeter attribute if Greeter is not defined anywhere in app.js.



      Can somehow help explain this so I can better understand the code?







      javascript






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Jan 3 at 5:24









      Ben Beck

      1,9381616




      1,9381616










      asked Jan 3 at 0:17









      James MitchellJames Mitchell

      80931434




      80931434
























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          Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.






          share|improve this answer























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            Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.






            share|improve this answer




























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              Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.






              share|improve this answer


























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                Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.






                share|improve this answer













                Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.







                share|improve this answer












                share|improve this answer



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                answered Jan 3 at 0:35









                jonnorjonnor

                724410




                724410
































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