Using indexOf to search an array of objects for a certain property

Question

I have an array set like tempArray[i] = {Name: 'foo', Data: 'bar'}
How would you use indexOf to search through tempArray looking to see if the name element was present? I.e

if(tempArray.indexOf('foo') > -1)
{
 //do stuff
}

Ive tried this way but it never seems to be true because I think 'foo' is not accessible due to it being reference by the .Name

`tempArray[i].Name.indexOf('foo')` is the right way.. incase if a big array then iterate — Praveen, Apr 10 '15 at 15:28

score 1 · Accepted Answer · answered Apr 10 '15 at 15:32

1

Why not just check for the property?

tempArray[i] = {Name: 'foo', Data: 'bar'}

if(tempArray[i].name)
{
 //do stuff
}

answered Apr 10 '15 at 15:32

joshvito

1,498
18
23

If `name` is falsy (evaluates to `false` like `0`, `false`, `null`) then it would also fail, despite existing. – Matt Apr 10 '15 at 15:36

score 0 · Answer 2 · answered Apr 10 '15 at 15:30

0

Assuming you want to search through the array for an object with Name property:

//this assumes tempArray has objects only!
for(var i = 0, len = tempArray.length; i< len; i++){
  if(tempArray[i].hasOwnProperty('Name')) {

    //do stuff
  }
}

answered Apr 10 '15 at 15:30

Bwaxxlo

1,860
13
18

after that check you need to a `indexOf` operation like `if(tempArray[i].Name.indexOf('foo') > -1) {}` – Praveen Apr 10 '15 at 15:32
@Praveen `Object.prototype.indexOf === undefined //true`. In other words, `tempArray[i]` is an object and not an array! – Bwaxxlo Apr 10 '15 at 15:34
I thought OP is looking for the `array` elements with `Name` as `foo` – Praveen Apr 10 '15 at 15:36
That doesn't really make sense. Array is a list and not a dictionary/key-reference – Bwaxxlo Apr 10 '15 at 15:38

score 0 · Answer 3 · answered Apr 10 '15 at 15:34

0

That is an object, and you can do this to check that the Name property is present:

for (var i = 0; i < tempArray.length; i++)
{
    if (Object.keys(tempArray[i]).indexOf('Name') >= 0)
    {
        // do soemthing
    }
}

answered Apr 10 '15 at 15:34

Matt

1,377
2
13
26

Using indexOf to search an array of objects for a certain property

3 Answers3