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0

I am trying to create a function that swaps 'keys' with 'values' in an Object. For some reason, I'm getting a TypeError: object.entries is not a function. What am I missing or doing wrong here?

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 this.entries().forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

Further testing reveals:

let foo = a: 1, b: 2, c: 3 
typeof foo // "object"
foo instanceof Object // true
foo.entries // undefined
foo.entries() // Uncaught TypeError: foo.entries is not a function

Update:

So what I learned is that objects (i.e. let foo = a: 1 ) do not inherit the .entries, .keys, or .values functions as properties, and I must access those functions by calling Object.entries(foo) as pointed out by tehhowch / SylvainF. Working code:

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 Object.entries(this).forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

// Example
let foo = a: 1, b: 2, c: 3 
foo.swapKeysValues()

// Output
1: "a", 2: "b", 3: "c"

Thank you tehhowch / SylvainF!

node.js nwjs

share|improve this question

edited Mar 8 at 13:59

caffeinatedbits

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you create a function with the keyword function, this will refer to the function itself. There is no entries method defined in your function.
  
  – Seblor
  Mar 8 at 13:37
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Object.entries(someObj).
  
  – tehhowch
  Mar 8 at 13:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't understand, considering I'm running the above 'foo' test code in the developer tools console. Same result in Chrome 72 browser.
  
  – caffeinatedbits
  Mar 8 at 13:46
  

  
  
  
  

add a comment | 

0

I am trying to create a function that swaps 'keys' with 'values' in an Object. For some reason, I'm getting a TypeError: object.entries is not a function. What am I missing or doing wrong here?

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 this.entries().forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

Further testing reveals:

let foo = a: 1, b: 2, c: 3 
typeof foo // "object"
foo instanceof Object // true
foo.entries // undefined
foo.entries() // Uncaught TypeError: foo.entries is not a function

Update:

So what I learned is that objects (i.e. let foo = a: 1 ) do not inherit the .entries, .keys, or .values functions as properties, and I must access those functions by calling Object.entries(foo) as pointed out by tehhowch / SylvainF. Working code:

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 Object.entries(this).forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

// Example
let foo = a: 1, b: 2, c: 3 
foo.swapKeysValues()

// Output
1: "a", 2: "b", 3: "c"

Thank you tehhowch / SylvainF!

node.js nwjs

share|improve this question

edited Mar 8 at 13:59

caffeinatedbits

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  If you create a function with the keyword function, this will refer to the function itself. There is no entries method defined in your function.
  
  – Seblor
  Mar 8 at 13:37
  
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Object.entries(someObj).
  
  – tehhowch
  Mar 8 at 13:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I don't understand, considering I'm running the above 'foo' test code in the developer tools console. Same result in Chrome 72 browser.
  
  – caffeinatedbits
  Mar 8 at 13:46
  

  
  
  
  

add a comment | 

I am trying to create a function that swaps 'keys' with 'values' in an Object. For some reason, I'm getting a TypeError: object.entries is not a function. What am I missing or doing wrong here?

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 this.entries().forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

Further testing reveals:

let foo = a: 1, b: 2, c: 3 
typeof foo // "object"
foo instanceof Object // true
foo.entries // undefined
foo.entries() // Uncaught TypeError: foo.entries is not a function

Update:

So what I learned is that objects (i.e. let foo = a: 1 ) do not inherit the .entries, .keys, or .values functions as properties, and I must access those functions by calling Object.entries(foo) as pointed out by tehhowch / SylvainF. Working code:

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 Object.entries(this).forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

// Example
let foo = a: 1, b: 2, c: 3 
foo.swapKeysValues()

// Output
1: "a", 2: "b", 3: "c"

Thank you tehhowch / SylvainF!

node.js nwjs

share|improve this question

edited Mar 8 at 13:59

caffeinatedbits

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 this.entries().forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

let foo = a: 1, b: 2, c: 3 
typeof foo // "object"
foo instanceof Object // true
foo.entries // undefined
foo.entries() // Uncaught TypeError: foo.entries is not a function

Object.defineProperty(Object.prototype, 'swapKeysValues', 
 value: function() 
 let obj = ;
 Object.entries(this).forEach(([key, value]) => 
 obj[value] = key;
 );
 return obj;
 
);

// Example
let foo = a: 1, b: 2, c: 3 
foo.swapKeysValues()

// Output
1: "a", 2: "b", 3: "c"

share|improve this question

edited Mar 8 at 13:59

caffeinatedbits

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

share|improve this question

edited Mar 8 at 13:59

caffeinatedbits

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

asked Mar 8 at 13:35

caffeinatedbitscaffeinatedbits

236

1 Answer
1

active

oldest

votes

0

Like @tehhowch says in the comments, the syntax is Object.entries(foo)

You can see the MDn page: https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Object/entries

share|improve this answer

answered Mar 8 at 13:41

SylvainFSylvainF

183113

add a comment | 

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0

Like @tehhowch says in the comments, the syntax is Object.entries(foo)

You can see the MDn page: https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Object/entries

share|improve this answer

answered Mar 8 at 13:41

SylvainFSylvainF

183113

add a comment | 

0

Like @tehhowch says in the comments, the syntax is Object.entries(foo)

You can see the MDn page: https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Object/entries

share|improve this answer

answered Mar 8 at 13:41

SylvainFSylvainF

183113

add a comment | 

Like @tehhowch says in the comments, the syntax is Object.entries(foo)

You can see the MDn page: https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Object/entries

share|improve this answer

answered Mar 8 at 13:41

SylvainFSylvainF

183113

share|improve this answer

answered Mar 8 at 13:41

SylvainFSylvainF

183113

answered Mar 8 at 13:41

SylvainFSylvainF

183113

answered Mar 8 at 13:41

SylvainFSylvainF

183113