How to filter data of an object array with lodash

Question

var brands = [];
brands = [null, {
  "id": "1",
  "image": "/images/brands/surf_excel.png",
  "name": "Surf Excel",
  "productCount": "6"
}, {
  "id": "2",
  "image": "/images/brands/rin.png",
  "name": "Rin",
  "productCount": "5"
}, {
  "id": "3",
  "image": "/images/brands/ariel.png",
  "name": "Ariel",
  "productCount": "4"
}];

Now i want to get the name where id = 3. I tried

var data = _.filter(brands, { 'id': 3 });
console.log(data.name);

But its giving error can't read property of undefined. Assuing there will be only one record for id =3, Can anyne help me on this. How to get name from given id in the above structure.

If there is any better way to get the same result that is also appreciated.

Satpal · Accepted Answer · 2016-08-25 05:39:04Z

6

As you have specified lodash and using it's _.filter() method. You can use pass predicate which can a function which will be invoke per iteration. As note it will return you an array.

var data = _.filter(brands, function(brand){
   return brand != null && brand.id == 3;
});
console.log(data[0].name);

if you want only one element the use _.find()

var data = _.find(brands, function(brand){
   return brand != null && brand.id == 3;
});
console.log(data.name);

answered Aug 25, 2016 at 5:39

Satpal

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Comments

Pranav C Balan · Accepted Answer · 2016-08-25 05:54:42Z

6

Use native JavaScript Array#find method.

var brands = [];
brands = [null, {
  "id": "1",
  "image": "/images/brands/surf_excel.png",
  "name": "Surf Excel",
  "productCount": "6"
}, {
  "id": "2",
  "image": "/images/brands/rin.png",
  "name": "Rin",
  "productCount": "5"
}, {
  "id": "3",
  "image": "/images/brands/ariel.png",
  "name": "Ariel",
  "productCount": "4"
}];

var data = brands.find(function(v) {
  return v && v.id == "3";
});

console.log(data.name);

Check polyfill option for find method for older browser.

If you want to filter out the array then use Array#filter method.

var brands = [];
brands = [null, {
  "id": "1",
  "image": "/images/brands/surf_excel.png",
  "name": "Surf Excel",
  "productCount": "6"
}, {
  "id": "2",
  "image": "/images/brands/rin.png",
  "name": "Rin",
  "productCount": "5"
}, {
  "id": "3",
  "image": "/images/brands/ariel.png",
  "name": "Ariel",
  "productCount": "4"
}];

var data = brands.filter(function(v) {
  return v && v.id == "3";
});

console.log(data[0].name);

UPDATE : You are provided an object as the second argument as per documentation which uses _.matches for property value comparison. In your array id property holds a string value but you were provided as a number in the filter just change it to string will make it work or use callback function as in @Satpal answer.

var brands = [];
brands = [null, {
  "id": "1",
  "image": "/images/brands/surf_excel.png",
  "name": "Surf Excel",
  "productCount": "6"
}, {
  "id": "2",
  "image": "/images/brands/rin.png",
  "name": "Rin",
  "productCount": "5"
}, {
  "id": "3",
  "image": "/images/brands/ariel.png",
  "name": "Ariel",
  "productCount": "4"
}];
var data = _.filter(brands, {
  'id': "3"
});
console.log(data);

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.js"></script>

edited Aug 25, 2016 at 5:54

answered Aug 25, 2016 at 5:33

Pranav C Balan

115k25 gold badges172 silver badges195 bronze badges

3 Comments

Rayon Over a year ago

IMO, If OP is asking about filter, there must be possibility of multiple elements having asked id

Pranav C Balan Over a year ago

@Rayon : then he wouldn't use data.name :)

Pranav C Balan Over a year ago

@Rayon : anyway I just added filter method also :)

Adam Boduch · Accepted Answer · 2016-08-25 06:22:50Z

0

Aside from using filter() instead of find(), you're actually pretty close. The reason you're not seeing any results is because the object predicates that you can pass to find()/filter() perform strict equality comparisons. Meaning, 3 === '3' will evaluate to false.

answered Aug 25, 2016 at 6:22

Adam Boduch

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