/Yuniku

JavaScript : Remove duplicates from an array of objects

Primary LanguageHTML

Yuniku

A simple function to kick out duplicate values from an array of objects in JavaScript.

How to

Array with duplicates

var data = [
            {
                name: "John",
                code: "124"
            },
            {
                name: "George",
                code: "122"
            },
            {
                name: "John",
                code: "xxx"
            },
            {
                name: "Ringo",
                code: "124"
            },
            {
                name: "Paul",
                code: "123"
            },
            {
                name: "George",
                code: "111"
            },
        ];

The main function filter

var yuniku = {
    filter: function (array, key) {
        var noDuplicatesArray = [];
        var temp = [];
        for (var i in array) {
            temp[array[i][key]] = array[i];
        }
        for (var i in temp) {
            noDuplicatesArray.push(temp[i]);
        }
        return noDuplicatesArray;
    }
}

Since no two objects can have the same key, so basically what this function does is looping through each object in your array and assign it a unique key. Instead of having two keys John from the example array, it will overwrite it rather than creating a new one.

filter takes two parameters :

  1. An array
  2. The key on which duplicates are not allowed

With main.js included, you can call yuniku from anywhere un your projects as follows :

JSON.stringify(yuniku.filter(data, "name"))