Getting rid of redundant elements in an array using Javascript or AngularJS

Case Study 1

A situation arises where an API I am using returns an array with duplicate values.

var originalArray = [{id:1, value:23},{id:1, value:24},{id:1, value:22},{id:2, value:26},{id:3, value:26}]; //example

Inquiry 1 -> How can I remove the duplicates to achieve the desired outcome:

var newArray = [{id:1, value:23 },{id:2, value:26},{id:3, value:26}];

Case Study 2

During my pagination process, a new array is fetched.

var fetchedArray = [{id:2, value:27},{id:2, value:28},{id:3, value:29},{id:4, value:28},{id:5, value:23}]; //example

I then iterate through the new array and add its elements to another array.

var targetArray = [{id:1, value:23},{id:2, value:27},{id:3, value:27}];

angular.forEach(fetchedArray, function(item){
              targetArray.push(item)                           
         });

Inquiry 2 -> What measures can be taken to prevent an object in the newly fetched array from being added to the target array if it already exists there?

Desired outcome:

var targetArray = [{id:1, value:23},{id:2, value:27},{id:3, value:27},{id:4, value:28},{id:5, value:23}]

Answer №1

A helpful tool I recommend is the Lodash library, which can be found at https://lodash.com. It truly streamlines many processes.

If you decide to incorporate Lodash into your work, don't forget about its handy uniq function (https://lodash.com/docs#uniq).

var newArrayWithoutDuplicates = _.uniq(originalArray, 'key');

In the code snippet above, originalArray represents the array you are working with, and key identifies the property by which objects are compared for uniqueness.

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