Object.keys returns an empty array for an object containing properties
My project contains an ES6 class whose constructor is defined as follows:
constructor() {
this.campaignName = 'United Way';
this.campaign = {};
this.questions = {};
this.benefits = {};
this.assistors = {};
this.locations = {};
this.buildDataObjects = this.buildDataObjects.bind(this);
this.retrieve();
}
Later in the code, the properties with default values of empty objects are given new values using Object.assign; however, I do not believe that code has any relevance for solving the problem at hand, so it is not included.
Elsewhere in the project's codebase, an instance of the class is being output using console.info:
As evident from the screenshot, there is seemingly nothing unusual about the object.
Next, the object's "questions" property is output:
The first line in the screenshot is an empty object, even though the output below includes the object's properties. However, those properties are inaccessible, as evident by the fact that calling Object.keys with the given object produces an empty array.
I am at a total loss as to the cause of this behavior and would appreciate some insight. Thanks in advance!
javascript ecmascript-6
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
add a comment |
My project contains an ES6 class whose constructor is defined as follows:
constructor() {
this.campaignName = 'United Way';
this.campaign = {};
this.questions = {};
this.benefits = {};
this.assistors = {};
this.locations = {};
this.buildDataObjects = this.buildDataObjects.bind(this);
this.retrieve();
}
Later in the code, the properties with default values of empty objects are given new values using Object.assign; however, I do not believe that code has any relevance for solving the problem at hand, so it is not included.
Elsewhere in the project's codebase, an instance of the class is being output using console.info:
As evident from the screenshot, there is seemingly nothing unusual about the object.
Next, the object's "questions" property is output:
The first line in the screenshot is an empty object, even though the output below includes the object's properties. However, those properties are inaccessible, as evident by the fact that calling Object.keys with the given object produces an empty array.
I am at a total loss as to the cause of this behavior and would appreciate some insight. Thanks in advance!
javascript ecmascript-6
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
The fact that the object shows as{}and afterwards has elements tells you that the questions only exist after you log them in the console. Hence the how and when the "questions" are generated/assigned does matter.
– Andreas
Nov 22 '18 at 17:36
Interesting...the second line is part of the same console.info output so how can they only exist after they're logged?
– Boris Layvant
Nov 22 '18 at 17:40
1
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
– Andreas
Nov 22 '18 at 17:44
@Andres you are correct. It turns out that the assignment of a new value for questions was taking place after console.info was called.
– Boris Layvant
Nov 22 '18 at 18:05
add a comment |
My project contains an ES6 class whose constructor is defined as follows:
constructor() {
this.campaignName = 'United Way';
this.campaign = {};
this.questions = {};
this.benefits = {};
this.assistors = {};
this.locations = {};
this.buildDataObjects = this.buildDataObjects.bind(this);
this.retrieve();
}
Later in the code, the properties with default values of empty objects are given new values using Object.assign; however, I do not believe that code has any relevance for solving the problem at hand, so it is not included.
Elsewhere in the project's codebase, an instance of the class is being output using console.info:
As evident from the screenshot, there is seemingly nothing unusual about the object.
Next, the object's "questions" property is output:
The first line in the screenshot is an empty object, even though the output below includes the object's properties. However, those properties are inaccessible, as evident by the fact that calling Object.keys with the given object produces an empty array.
I am at a total loss as to the cause of this behavior and would appreciate some insight. Thanks in advance!
javascript ecmascript-6
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
My project contains an ES6 class whose constructor is defined as follows:
constructor() {
this.campaignName = 'United Way';
this.campaign = {};
this.questions = {};
this.benefits = {};
this.assistors = {};
this.locations = {};
this.buildDataObjects = this.buildDataObjects.bind(this);
this.retrieve();
}
Later in the code, the properties with default values of empty objects are given new values using Object.assign; however, I do not believe that code has any relevance for solving the problem at hand, so it is not included.
Elsewhere in the project's codebase, an instance of the class is being output using console.info:
As evident from the screenshot, there is seemingly nothing unusual about the object.
Next, the object's "questions" property is output:
The first line in the screenshot is an empty object, even though the output below includes the object's properties. However, those properties are inaccessible, as evident by the fact that calling Object.keys with the given object produces an empty array.
I am at a total loss as to the cause of this behavior and would appreciate some insight. Thanks in advance!
javascript ecmascript-6
javascript ecmascript-6
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
asked Nov 22 '18 at 17:28
Boris LayvantBoris Layvant
287
287
The fact that the object shows as{}and afterwards has elements tells you that the questions only exist after you log them in the console. Hence the how and when the "questions" are generated/assigned does matter.
– Andreas
Nov 22 '18 at 17:36
Interesting...the second line is part of the same console.info output so how can they only exist after they're logged?
– Boris Layvant
Nov 22 '18 at 17:40
1
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
– Andreas
Nov 22 '18 at 17:44
@Andres you are correct. It turns out that the assignment of a new value for questions was taking place after console.info was called.
– Boris Layvant
Nov 22 '18 at 18:05
add a comment |
The fact that the object shows as{}and afterwards has elements tells you that the questions only exist after you log them in the console. Hence the how and when the "questions" are generated/assigned does matter.
– Andreas
Nov 22 '18 at 17:36
Interesting...the second line is part of the same console.info output so how can they only exist after they're logged?
– Boris Layvant
Nov 22 '18 at 17:40
1
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
– Andreas
Nov 22 '18 at 17:44
@Andres you are correct. It turns out that the assignment of a new value for questions was taking place after console.info was called.
– Boris Layvant
Nov 22 '18 at 18:05
The fact that the object shows as
{} and afterwards has elements tells you that the questions only exist after you log them in the console. Hence the how and when the "questions" are generated/assigned does matter.– Andreas
Nov 22 '18 at 17:36
The fact that the object shows as
{} and afterwards has elements tells you that the questions only exist after you log them in the console. Hence the how and when the "questions" are generated/assigned does matter.– Andreas
Nov 22 '18 at 17:36
Interesting...the second line is part of the same console.info output so how can they only exist after they're logged?
– Boris Layvant
Nov 22 '18 at 17:40
Interesting...the second line is part of the same console.info output so how can they only exist after they're logged?
– Boris Layvant
Nov 22 '18 at 17:40
1
1
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
– Andreas
Nov 22 '18 at 17:44
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
– Andreas
Nov 22 '18 at 17:44
@Andres you are correct. It turns out that the assignment of a new value for questions was taking place after console.info was called.
– Boris Layvant
Nov 22 '18 at 18:05
@Andres you are correct. It turns out that the assignment of a new value for questions was taking place after console.info was called.
– Boris Layvant
Nov 22 '18 at 18:05
add a comment |
1 Answer
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oldest
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As @Andreas pointed out, the console output was being performed before the assignment of a new value to "questions" was completed.
As a side-note, my confusion was exacerbated by the presence of properties below the empty object in the console output, which are apparently somehow appended after the fact.
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
You should hover over the blue bloxedi.
– Felix Kling
Nov 22 '18 at 19:33
add a comment |
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As @Andreas pointed out, the console output was being performed before the assignment of a new value to "questions" was completed.
As a side-note, my confusion was exacerbated by the presence of properties below the empty object in the console output, which are apparently somehow appended after the fact.
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
You should hover over the blue bloxedi.
– Felix Kling
Nov 22 '18 at 19:33
add a comment |
As @Andreas pointed out, the console output was being performed before the assignment of a new value to "questions" was completed.
As a side-note, my confusion was exacerbated by the presence of properties below the empty object in the console output, which are apparently somehow appended after the fact.
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
You should hover over the blue bloxedi.
– Felix Kling
Nov 22 '18 at 19:33
add a comment |
As @Andreas pointed out, the console output was being performed before the assignment of a new value to "questions" was completed.
As a side-note, my confusion was exacerbated by the presence of properties below the empty object in the console output, which are apparently somehow appended after the fact.
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
As @Andreas pointed out, the console output was being performed before the assignment of a new value to "questions" was completed.
As a side-note, my confusion was exacerbated by the presence of properties below the empty object in the console output, which are apparently somehow appended after the fact.
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
answered Nov 22 '18 at 18:15
Boris LayvantBoris Layvant
287
287
You should hover over the blue bloxedi.
– Felix Kling
Nov 22 '18 at 19:33
add a comment |
You should hover over the blue bloxedi.
– Felix Kling
Nov 22 '18 at 19:33
You should hover over the blue bloxed
i.– Felix Kling
Nov 22 '18 at 19:33
You should hover over the blue bloxed
i.– Felix Kling
Nov 22 '18 at 19:33
add a comment |
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The fact that the object shows as
{}and afterwards has elements tells you that the questions only exist after you log them in the console. Hence the how and when the "questions" are generated/assigned does matter.– Andreas
Nov 22 '18 at 17:36
Interesting...the second line is part of the same console.info output so how can they only exist after they're logged?
– Boris Layvant
Nov 22 '18 at 17:40
1
Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference
– Andreas
Nov 22 '18 at 17:44
@Andres you are correct. It turns out that the assignment of a new value for questions was taking place after console.info was called.
– Boris Layvant
Nov 22 '18 at 18:05