Checking the presence of some values in an array of hashes in jQuery or Javascript

Question

I want to check if a values of some key are not null or blank in an array or hashes

array = [{a:'1', b:''}, {a:'2', b:''}, {a:'3', b:null}]

Trying assert that all b are present (no blank or nil). My current approach with jQuery

function checkPresence(array){
    result = false;
    $.each(array, function (i, field) {
        if(field['b'] !== '' && field['b'] !== null){
            result = true;
            return false;
        };
    });
    return result;
}

I believe/hope jQuery and Javascript have a better solution for it, but don't know it (yet).

Can you help?

You may go through [this](https://stackoverflow.com/questions/19839952/all-falsey-values-in-javascript) — Madhavan.V, Dec 14 '17 at 12:53
`array.every(function(e){ return (Object.keys(e).indexOf('b') > -1) && e['b'] !== null; });` https://jsfiddle.net/btwuLm8s/ — briosheje, Dec 14 '17 at 12:54
So, what exactly do you want to return under what conditions? — Cerbrus, Dec 14 '17 at 12:54

score 1 · Answer 1 · answered Dec 14 '17 at 12:59

1

var array = [{a:'1', b:''}, {a:'2', b:''}, {a:'3', b:null}]
array.some(item => !item.b)
// true if anything null or undefined or ""

answered Dec 14 '17 at 12:59

zabusa

2,520
21
25

score 1 · Accepted Answer · answered Dec 14 '17 at 13:00

1

It can be easily done with array.prototype.some :

var array = [{a:'1', b:''}, {a:'2', b:''}, {a:'', b:null}];
var res = array.some(e => e.b);
console.log(res);

var array = [{a:'1', b:''}, {a:'2', b:'something'}, {a:'', b:null}];
var res = array.some(e => e.b);
console.log(res);

answered Dec 14 '17 at 13:00

Faly

13,291
2
19
37

just for those not using arrow functions `return array.some(function(e){ if(e.value !== '') return true; });` – Frank Etoundi Dec 14 '17 at 19:36

score 1 · Answer 3 · answered Dec 14 '17 at 13:03

You can use javascript's foreach function which is a function of array.

function checkPresence(array){

    array.foreach(function(element) {
        if(field['b'] === '' || field['b'] === null)
            return false;
    });

    return true;
}

I recommend you to check out https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference for more information about javascript.

Checking the presence of some values in an array of hashes in jQuery or Javascript

3 Answers3