Javascript Issue with function

Question

I have a function that is returning an "Unexpected Token New" error at line 3. I am not sure why this is happening. It seems correct to me.

function flat_array(array){

 var new = [];

  for(var i = 0; i < array.length; i++)
  {
      new = new.concat(array[i]);
  }

  return new;
}

new is a reserved keyword.. change the variable name and it will work.. — Jaydeep
– Jaydeep, Commented Jul 31, 2019 at 14:18
Sidenote: Array.flat() and Array.flatMap() are being implemented in modern browsers, so depending on which browsers you support, you might want to use the native .flat() method. — Shilly
– Shilly, Commented Jul 31, 2019 at 14:22
This question is similar to: What is the 'new' keyword in JavaScript?. If you believe it’s different, please edit the question, make it clear how it’s different and/or how the answers on that question are not helpful for your problem. — dumbass
– dumbass, Commented Oct 8, 2024 at 15:08
Or perhaps <stackoverflow.com/q/8099270/3840170> would make for a better duplicate. — dumbass
– dumbass, Commented Oct 8, 2024 at 15:10

Carcigenicate · Accepted Answer · 2019-07-31 14:17:53Z

2

new is a reserved word for constructing objects (note the highlighting here even):

obj = new Object()

It can't be used as a name for variables. Change it to something else.

answered Jul 31, 2019 at 14:17

Carcigenicate

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Comments

Sirmyself · Accepted Answer · 2019-07-31 14:24:26Z

1

you can't name a variable called new as the word is reserved (like in most programming languages)

I'd suggest calling your variable "newObj" or something like that if you really want the "new" part, but you can't call a variable with a reserved word. Here's a list of keywords in JavaScript

edited Jul 31, 2019 at 14:24

answered Jul 31, 2019 at 14:18

Sirmyself

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Doğancan Arabacı · Accepted Answer · 2019-07-31 14:18:55Z

0

new is a reserved word. You cannot use it as a name of a variable. Changing your code to below should work fine:

function flat_array(arr){
  var result = [];

  for(var i = 0; i < arr.length; i++) {
      result = result.concat(arr[i]);
  }

  return result;
}

answered Jul 31, 2019 at 14:18

Doğancan Arabacı

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Comments

Sami Ahmed Siddiqui · Accepted Answer · 2019-07-31 14:27:16Z

0

new is the reserved word in JS. You can't use it as a variable name. Here is the list of the JS reserved words: https://www.w3schools.com/js/js_reserved.asp

You can find what's the purpose of new here: What is the 'new' keyword in JavaScript?

answered Jul 31, 2019 at 14:27

Sami Ahmed Siddiqui

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