Verify if an element within an array is either null or has no value

Question

I am dealing with an array of objects and I need to check if the "value" for a specific "key" in any of the objects is "null". For example:

var array = 
[{name:{} address : "something"},
{name:null address : "something2"},
{name:{} address : "something23"}]

In the scenario above, my goal is to determine if any of the name object is null, and then return false

I would appreciate any assistance or guidance on where to find more information regarding this issue.

Answer 1

Answer №1

To check for undefined values in an array, you can use Array's some() method.

var data = [
  { name: ..., value: ... },
  ...
];
var hasUndefinedName = data.some(e => e.name===null || e.name===undefined);

If you prefer using older ES5 syntax:

...
var hasUndefinedName = data.some(function(e) {
  return (e.name===null || e.name===undefined);
});

If you want to remove elements with undefined name values, you can use Array's filter() method:

var data = [
  { name: ..., value: ... },
  ...
];
var filtered = data.filter(e => e.name!==null && e.name!==undefined);

Answer 2

To check for undefined values in an array, you can use Array's some() method.

var data = [
  { name: ..., value: ... },
  ...
];
var hasUndefinedName = data.some(e => e.name===null || e.name===undefined);

If you prefer using older ES5 syntax:

...
var hasUndefinedName = data.some(function(e) {
  return (e.name===null || e.name===undefined);
});

If you want to remove elements with undefined name values, you can use Array's filter() method:

var data = [
  { name: ..., value: ... },
  ...
];
var filtered = data.filter(e => e.name!==null && e.name!==undefined);

Answer 3

Here is the solution you've been looking for:

let flag = false;
myArray.forEach(element => {
    flag = flag || Object.keys(element).some(property => element[property] == null);
});

If flag is equal to true, it means that there is at least one element in the array with a property that is null;

I intentionally used == instead of === because == null covers both null and undefined.

Answer 4

Here is the solution you've been looking for:

let flag = false;
myArray.forEach(element => {
    flag = flag || Object.keys(element).some(property => element[property] == null);
});

If flag is equal to true, it means that there is at least one element in the array with a property that is null;

I intentionally used == instead of === because == null covers both null and undefined.