making nested objects array and checking if the key exists in objs

Question

I am trying to check if the keys exits in array of objects. I am getting false each time when I pass existing key to my function.

var connect_clients = [];
connect_clients.push({
  'a': val
});

function lookup(name) {
  for (var i = 0, len = connect_clients.length; i < len; i++) {
    if (connect_clients[i].key === name)
      return true;
  }
  return false;
}

console.log(lookup('a'));

Is there anything wrong?

val is dynamic var lets say b and key comes from the loop inside which should be a — user5117846
– user5117846, Commented Nov 27, 2015 at 8:49

thefourtheye · Accepted Answer · 2015-11-27 07:52:47Z

1

connect_clients[i].key refers to the actual property named key, not the keys of the object.

For this case, you can use Object.keys to get an array of keys of an object and use Array.prototype.some to make sure that at least one of the objects has the key. For example,

function lookup(name) {
  return connect_clients.some(function(client) {
    return Object.keys(client).indexOf(name) !== -1;
  });
}

edited Nov 27, 2015 at 7:52

answered Nov 27, 2015 at 7:51

thefourtheye

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Comments

Rex Hsu · Accepted Answer · 2015-11-27 08:18:08Z

0

Use Object.keys() to get keys of an object.

var val = 'val';
var connect_clients = [];

connect_clients.push({
  'a': val
});

function lookup(keyName) {
    var i;

    for ( i = 0; i < connect_clients.length; i++) {
        var keys = Object.keys(connect_clients[i]);

        if(keys.indexOf(keyName) !== -1) {
            return true;
        }
    }

    return false;
}

console.log(lookup('a'));

answered Nov 27, 2015 at 8:18

Rex Hsu

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