Truffle Pet Shop understanding App.js code
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
edited Jan 3 at 5:24
Ben Beck
1,9381616
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
add a comment |
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
edited Jan 3 at 5:24
Ben Beck
1,9381616
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
add a comment |
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
edited Jan 3 at 5:24
Ben Beck
1,9381616
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
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
javascript
edited Jan 3 at 5:24
Ben Beck
1,9381616
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
edited Jan 3 at 5:24
Ben Beck
1,9381616
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
edited Jan 3 at 5:24
Ben Beck
1,9381616
edited Jan 3 at 5:24
Ben Beck
1,9381616
edited Jan 3 at 5:24
Ben Beck
1,9381616
1,9381616
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
asked Jan 3 at 0:17
James MitchellJames Mitchell
80931434
80931434
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.
answered Jan 3 at 0:35
jonnorjonnor
724410
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f54014848%2ftruffle-pet-shop-understanding-app-js-code%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.
answered Jan 3 at 0:35
jonnorjonnor
724410
add a comment |
Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.
answered Jan 3 at 0:35
jonnorjonnor
724410
add a comment |
Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.
answered Jan 3 at 0:35
jonnorjonnor
724410
Attributes can be dynamically added to objects in Javascript. So there is no need to define Greeter before setting it.
answered Jan 3 at 0:35
jonnorjonnor
724410
answered Jan 3 at 0:35
jonnorjonnor
724410
answered Jan 3 at 0:35
jonnorjonnor
724410
answered Jan 3 at 0:35
jonnorjonnor
724410
724410
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f54014848%2ftruffle-pet-shop-understanding-app-js-code%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
