CODEWITHSUNDEEP
javascript
Ionut Eugen
Ionut Eugen

Reputation: 501

Returning the index of an empty element inside an array

So I have an array let's say :

var arr = ['apples' , 'cherries' , 'strawberries']

and after so much coding, I get hungry so I eat the 'cherries' so now I have

arr = ['apples',null,'strawberries']

So I was wondering if there is some sort of JavaScript function that can return the first null element inside an array ?

Let's say for instance my grandma gives me 'potatoes' and I want to add them inside the null space I have like a good boy I am, and I need the index of that null element so I may know where to place my sweet goods from grandma.

Upvotes: 0

Views: 660

Answers (3)

Guilherme Geraldo
Guilherme Geraldo

Reputation: 11

try removing the element using below code :

var arr = ['apples' , 'cherries' , 'strawberries'];

arr.splice(1,1);

and remove and add try :

var arr = ['apples' , 'cherries' , 'strawberries'];

arr.splice(1,1, 'potatoes');

Upvotes: 1

Akrion
Akrion

Reputation: 18515

Since null is a falsy value you can simply use Array.findIndex and match on falsy values:

var arr = ['apples',null,'strawberries']

let index = arr.findIndex(x => !x)

console.log(index)
console.log(arr[index])

Upvotes: 1

Xavier Brassoud
Xavier Brassoud

Reputation: 717

From W3C documentation :

arr.findIndex(element => element === null);

Replace :

arr[arr.findIndex(element => element === null)] = "potatoes";

Upvotes: 1

Related Questions