Count of “Defined” Array Elements

Question

Given following array:

var arr = [undefined, undefined, 2, 5, undefined, undefined];

I\'d like to get the count of elements which are

Answer 1

Remove the values then check (remove null check here if you want)

const x = A.filter(item => item !== undefined || item !== null).length

With Lodash

const x = _.size(_.filter(A, item => !_.isNil(item)))