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“new Set” is returning an empty set in nodejs

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0

I was testing some websites using the below function with n, suddenly "new Set" started returning empty Array as the following:

function collectAllSameOriginAnchorsDeep(sameOrigin = true) 

const allElements = [];

// Some coding here 

const filtered = allElements

// Some coding here 

console.log(filtered) // The items are printed in the log probably


return Array.from(new Set(filtered)); // Nothing is getting returned!

If I replace the last line with return Array.from(filtered), then it works fine but I'm using "Set" to remove any repeated values.

node.js puppeteer

share|improve this question

edited Mar 23 at 12:43

Hatem Husam

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How much length/size of your filtered array?
  
  – Santosh Shinde
  Mar 23 at 12:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not more than a 100 item only
  
  – Hatem Husam
  Mar 23 at 12:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can create set object in top and add elements one by one , so you will get filtered elements
  
  – Santosh Shinde
  Mar 23 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
  
  – Santosh Shinde
  Mar 23 at 12:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you are using at the end then you need to convert back to array using array.from “ES6 — Set vs Array — What and when?” by Maya Shavin link.medium.com/UGFoKMd9hV
  
  – Santosh Shinde
  Mar 23 at 13:02
  

  
  
  
  

 | 
show 1 more comment

0

I was testing some websites using the below function with n, suddenly "new Set" started returning empty Array as the following:

function collectAllSameOriginAnchorsDeep(sameOrigin = true) 

const allElements = [];

// Some coding here 

const filtered = allElements

// Some coding here 

console.log(filtered) // The items are printed in the log probably


return Array.from(new Set(filtered)); // Nothing is getting returned!

If I replace the last line with return Array.from(filtered), then it works fine but I'm using "Set" to remove any repeated values.

node.js puppeteer

share|improve this question

edited Mar 23 at 12:43

Hatem Husam

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How much length/size of your filtered array?
  
  – Santosh Shinde
  Mar 23 at 12:45
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Not more than a 100 item only
  
  – Hatem Husam
  Mar 23 at 12:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You can create set object in top and add elements one by one , so you will get filtered elements
  
  – Santosh Shinde
  Mar 23 at 12:56
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…
  
  – Santosh Shinde
  Mar 23 at 12:57
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  If you are using at the end then you need to convert back to array using array.from “ES6 — Set vs Array — What and when?” by Maya Shavin link.medium.com/UGFoKMd9hV
  
  – Santosh Shinde
  Mar 23 at 13:02
  

  
  
  
  

 | 
show 1 more comment

I was testing some websites using the below function with n, suddenly "new Set" started returning empty Array as the following:

function collectAllSameOriginAnchorsDeep(sameOrigin = true) 

const allElements = [];

// Some coding here 

const filtered = allElements

// Some coding here 

console.log(filtered) // The items are printed in the log probably


return Array.from(new Set(filtered)); // Nothing is getting returned!

If I replace the last line with return Array.from(filtered), then it works fine but I'm using "Set" to remove any repeated values.

node.js puppeteer

share|improve this question

edited Mar 23 at 12:43

Hatem Husam

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

function collectAllSameOriginAnchorsDeep(sameOrigin = true) 

const allElements = [];

// Some coding here 

const filtered = allElements

// Some coding here 

console.log(filtered) // The items are printed in the log probably


return Array.from(new Set(filtered)); // Nothing is getting returned!

node.js puppeteer

node.js puppeteer

share|improve this question

edited Mar 23 at 12:43

Hatem Husam

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

share|improve this question

edited Mar 23 at 12:43

Hatem Husam

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

asked Mar 23 at 12:33

Hatem HusamHatem Husam

379

1 Answer
1

active

oldest

votes

0

Because Set receives iterable object as its input parameter, and will create set object respectively. Hence, we can construct a set from an array — but it will only include distinct elements from that array, aka no duplicate.

And of course, we can also convert a set back to array using Array.from() method.

let set = new Set([1,2,3]); // 1,2,3
let arr = Array.from(set);//[1,2,3]

So you need to convert set back to array , please check here to understand the difference between set and array.

Hope this will help you!

share|improve this answer

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950

add a comment | 

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0

Because Set receives iterable object as its input parameter, and will create set object respectively. Hence, we can construct a set from an array — but it will only include distinct elements from that array, aka no duplicate.

And of course, we can also convert a set back to array using Array.from() method.

let set = new Set([1,2,3]); // 1,2,3
let arr = Array.from(set);//[1,2,3]

So you need to convert set back to array , please check here to understand the difference between set and array.

Hope this will help you!

share|improve this answer

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950

add a comment | 

0

Because Set receives iterable object as its input parameter, and will create set object respectively. Hence, we can construct a set from an array — but it will only include distinct elements from that array, aka no duplicate.

And of course, we can also convert a set back to array using Array.from() method.

let set = new Set([1,2,3]); // 1,2,3
let arr = Array.from(set);//[1,2,3]

So you need to convert set back to array , please check here to understand the difference between set and array.

Hope this will help you!

share|improve this answer

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950

add a comment | 

Because Set receives iterable object as its input parameter, and will create set object respectively. Hence, we can construct a set from an array — but it will only include distinct elements from that array, aka no duplicate.

And of course, we can also convert a set back to array using Array.from() method.

let set = new Set([1,2,3]); // 1,2,3
let arr = Array.from(set);//[1,2,3]

So you need to convert set back to array , please check here to understand the difference between set and array.

Hope this will help you!

share|improve this answer

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950

let set = new Set([1,2,3]); // 1,2,3
let arr = Array.from(set);//[1,2,3]

share|improve this answer

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950

answered Mar 23 at 13:07

Santosh ShindeSantosh Shinde

3,90822950