Can you help me figure out this error

Question

https://code.sololearn.com/WQelFu58r1RL/?ref=app

Am trying to multiply a list of array by 2 but am a null output

Answer 1

Tijan , You changed code in HTML tab not in JS😁

Answer 2

num[i] = num[i] * 2;
What you had done is multiply by the variable itself not by items of variable :)

Answer 3

You want to multiply every element of array by 2. right?

see this line:
```
num[i] = num * 2;
```

num*2 is resulting into NaN(Not a Number), because you are trying to perform arithmetic operation on non-numeric type.

valid statement will be:
```
num[i] = num[i] * 2;
```

Answer 4

🇮🇳Omkar🕉 yeah 😅 thanks man i apprecitate

Answer 5

Kuber Acharya thank you but can you explain it better am kinda new to this language

Answer 6

🇮🇳Omkar🕉 am still getting the same error

Answer 7

i just updated the code

Answer 8

Tijan

In your code it should be
num[i] = num[i]*2
but not
num[i] = num*2

-- Suggestion:
You can use Array.map() method for that purpose. It returns an array and you can save that to a new variable.

You can do a whole lot of things, multiply or divide with a constant number and more.
See more about it here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

Ex.
--------
let arr = [1,2,3,4,5];
let doubleArr = arr.map( (num) => {
return num*2;
}
// doubleArr = [2,4,6,8,10]
--------