javascript array is not working in console

Question

I have arrays in my code like this:

let shoppinglist = ['laptop','ram','screen'];

let anynum = [1,2,nan,true,null,'dog'];

let colour = ['red'];

let shoppingList2 = ['cheese','2 milk'];

let myapp = [0,1,2,3,4,5];

but I got this error when running:

Uncaught SyntaxError: Identifier 'colour' has already been declared
myapp
VM192:1 Uncaught ReferenceError: myapp is not defined
    at <anonymous>:1:1
(anonymous) @ VM192:1
shoppinglist.length
VM240:1 Uncaught ReferenceError: shoppinglist is not defined
    at <anonymous>:1:1
(anonymous) @ VM240:1
shoppingList2
VM264:1 Uncaught ReferenceError: shoppingList2 is not defined
    at <anonymous>:1:1
(anonymous) @ VM264:1

Show the code that throws these errors, the above code just consists of variable assignments. Also as @Kooilnc said, there's no such thing as nan , its NaN — Cypherjac
– Cypherjac, Commented Jun 20, 2020 at 8:58
You are showing us the variable declaration, but the problem you get is when you use them and this part of code is not provided. So first look at it and after that tell us what you have tried to solve . — Alain BUFERNE
– Alain BUFERNE, Commented Jun 20, 2020 at 9:25
Can you show all the javascript ? you are just showing the variables declaration — mmonteirocl
– mmonteirocl, Commented Jun 20, 2020 at 9:26

Gui Dadald · Accepted Answer · 2020-06-20 09:40:28Z

2

You most likely already declared the variable name 'colour' earlier in your code, so if you want to reassign it, use just:

colour = ['red'];

However, this will not work it you created the variable as 'const'. And nan should be NaN. In relation to the other errors, can you share the beginning of your code?

answered Jun 20, 2020 at 9:40

Gui Dadald

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1 Comment

Anurag Over a year ago

yes thankyou..even after refreshing page my code started working

Pramod · Accepted Answer · 2020-06-20 09:41:32Z

0

You have done a simple mistake there, nan is a keyword in javascript. You can make this as a string otherwise you can make it NaN.

  let shoppinglist = ['laptop','ram','screen'];

  let anynum = [1,2,NaN,true,null,'dog'];

  let colour = ['red'];

  let shoppingList2 = ['cheese','2 milk'];

  let myapp = [0,1,2,3,4,5];

answered Jun 20, 2020 at 9:41

Pramod

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1 Comment

Anurag Over a year ago

yes thankyou..even after refreshing page my code started working

Nayana Chandran · Accepted Answer · 2021-11-15 12:46:42Z

0

The value nan in the array anynum, is not just a value. nan is a keyword (built-in) put it as a string like let anynum = [1,2,'nan',true,null,'dog']; other than that array declaration is correct.

edited Nov 15, 2021 at 12:46

answered Jun 20, 2020 at 9:33

Nayana Chandran

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