How to find the name property from an array of Objects

Question

I am trying to get the value from an array of objects given the id, but I am not able to make it working. The problem is that I have an array of objects, so I don't know how to iterate over them. I know using the .map method could be a possible solution, but I'm new on this.

my method is that given a Id, it has to return me the name from the same object.

How could I iterate over them? I am using this actually:

getName(field_id: any): any {
var aux = 0;

  var obj = this.customFields[aux].filter(function (obj) {
    return obj.name === field_id;       
  })[0];
  aux ++;
}

where aux is an iterator. Ofc is not working.

var search=36;for(var i=0;i<array.length();i++){if(array[i].id=search){console.log("Here I am!");break;}} — Simon Hyll
– Simon Hyll, Commented Apr 28, 2017 at 10:22
Hi Simon, the problem is that I can not do the array.length. I just can do it if I do array[0].length() — Jotan
– Jotan, Commented Apr 28, 2017 at 10:24
Instead of using Array.prototype.filter and plucking the first element you can also use Array.prototype.find which will do that for you. — schroffl
– schroffl, Commented Apr 28, 2017 at 10:24
How come you can't use array.length? If it's an array of objects it should work (as in if it doesn't something is seriously wrong)... I'm assuming you have something like var array = [{id:36},{id:35}]; — Simon Hyll
– Simon Hyll, Commented Apr 28, 2017 at 10:28
length is not a function, so for array # of items use .length — yezzz
– yezzz, Commented Apr 28, 2017 at 10:29

Shubham Khatri · Accepted Answer · 2017-04-28 10:26:37Z

1

considering array containing the objects, you can just use the filter function, no neeed to use the indexer

var arr = [
  {id: 1, name: "something"},
  {id: 2, name: "something1"},
  {id: 3, name: "something2"},
  {id: 4, name: "something3"},
  {id: 5, name: "something4"}
]
var id=3
var obj = arr.filter(function(obj) {

  return obj.id === id;
})
console.log(obj[0].name)

answered Apr 28, 2017 at 10:26

Shubham Khatri

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Comments

Maxime L · Accepted Answer · 2017-04-28 10:29:02Z

1

I think your issue is that you compare the name with the id. If you want to avoid loops:

// This find the correct entry corresponding to the id you are looking for
var correctField = this.customFields.find(function(field) {
  return field.id === field_id;
});
// Then you get the name from the entry
var nameToFind = correctField && correctField.name;

You might have to replace find depending on your browser support.

A way to replace it: this.customFields.filter()[0]

answered Apr 28, 2017 at 10:29

Maxime L

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Comments

Jagdish Idhate · Accepted Answer · 2017-04-28 10:30:13Z

1

You can simply use for loop as below

var arr = [{id:1,name:"abc"},{id:2,name:"pqr"},{id:3,name:"lmn"}]

function getName(id){
  for(var i=0;i<arr.length;i++)
    if(arr[i].id==id)
      return arr[i].name;
   return null 
}

getName(2);// pqr

answered Apr 28, 2017 at 10:30

Jagdish Idhate

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