how to validate if an array is empty using validator

Question

I need to check if the users have filled in array values or they are empty . I went through the validator docs

but I don't see any function which works on array .

isEmpty(str) check if the string has a length of zero.

Answer 1

validator validates and sanitizes strings only. so none of the methods in there will help you achieve what you want. just use Array.length property.

Answer 2

If by empty array, you mean: []

This will do:

if(!array.length)
  console.log(`I'm not empty`);

If you mean an array with empty values, such as: [null, '']

You can use: .some to check if at least one item is empty, or .every to check that every item is empty.

const array = [null, ''];

!array.some(Boolean); // True if at least one is falsy
!array.every(Boolean); // True if every item is falsy

If you want some custom validation, you can pass your custom function too.

function empty(item) {
   // What ever you consider by empty, check it here
   // return true if it is empty
   if(typeof item === 'string')
      return !item.trim();

   return !item;
}

array.some(empty); // true if at least one is empty
array.every(empty); // true if all of them are empty