I am trying to remove duplicate objects from an Array. For example, the object 'bison' appears twice.
var beasts = [ {'ant':false}, {'bison':true}, {'camel':true}, {'duck':false}, {'bison':false} ];
This is my attempted solution:
let a = beasts.indexOf(bison);
console.log(a);
However, I keep getting -1 as the result, indicating that the object cannot be found in the array.
Please note that the values of the objects are not relevant for this question.
Implement a solution using Array.filter along with Set
Keep track of a set containing unique keys. If the key is already in the set, return false, otherwise add it to the set and return true.
var animals = [ {'cat':false}, {'dog':true}, {'horse':true}, {'rabbit':false}, {'dog':false} ];
let set = new Set();
let result = animals.filter(obj => {
// Retrieve the key of the object
let key = Object.keys(obj)[0];
if(!set.has(key)) { // Check if key exists in set
// If key does not exist, add it to the set and return true (included in filter)
set.add(key);
return true;
}
});
console.log(result);In a straightforward manner
let heroes = ['Batman', 'Superman', 'Wonder Woman', 'Flash', 'Batman'];
let uniqueHeroes = [...new Set(heroes)];
console.log(uniqueHeroes); // 'Batman', 'Superman', 'Wonder Woman', 'Flash'
One way to achieve this programmatically is by creating a separate array to store the names of processed animals and then filtering the original array based on this new array.
var animals = [ {'cat':false}, {'dog':true}, {'elephant':true}, {'monkey':false}, {'lion':false} ];
const processedAnimals = [];
const filteredAnimals = animals.filter(function(animal) {
const animalName = Object.keys(animal)[0];
if(!processedAnimals.includes(animalName)){
processedAnimals.push(animalName);
return true;
}
return false;
});
If you'd like, you have the option to employ a straightforward forEach() loop that carries an operational complexity of O(n) to attain that specific result.
var creatures = [ {'ant':false}, {'bison':true}, {'camel':true}, {'duck':false}, {'bison':false} ];
var resObjects = {};
creatures.forEach((creature)=>{
var identifier = Object.keys(creature)[0];
if(!resObjects[identifier]){
resObjects[identifier] = creature;
}
});
var finalResultArray = Object.values(resObjects);
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