How to check if an associative array contains a certain JavaScript value?

Question

JavaScript

Hello!
How to check if array {1: "", 2: "123", 3:"",...} contains empty values?
Thanks to all!

Answer 1

Iterate through each of the properties and check. If it evaluates to false when converted to boolean, then it is empty.
There are two exceptions: a true boolean falseand a number 0, which will not be considered null.

var data = {1: "", 2: "123", 3:""};

function anyEmpty(obj) {
  var p, v;
  for( p in obj) {
    v = obj[p];
    if( !obj.hasOwnProperty(p)) continue;
    if( v === false || v === 0) continue;
    if( !v ) return true;
  }
  return false;
}

anyEmpty(data)  // true

Answer 2

in js {} is an ordinary object, in this language objects play two roles, as data carriers and how an ordinary object will return true if there is at least one empty value, null, undefined, "", false and so on.
will return the number of empty values

Answer 3

for..in