How to Remove Duplicate Elements from Array in JavaScript
JavaScript: Removing Duplicate Elements from an Array
How to Remove Duplicate Elements from Array in JavaScript
Removing duplicate elements from an array in JavaScript is useful to ensure data integrity and improve efficiency when working with unique values. By eliminating duplicates, you can simplify data processing, improve search and comparison operations, and enhance overall performance. One common approach is to convert the array into a Set object, which automatically removes duplicate values, and then convert it back to an array if needed. Alternatively, you can use methods like filter or reduce in combination with indexOf to create a new array with unique elements. This way, you can maintain a clean dataset and optimize your code for better functionality.
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1 - Using a Set to Remove Duplicates:
Create a Set from the array to automatically remove duplicates.
```javascript
const uniqueArray = […new Set(array)];
```
2) Using Filter Method:
Use the filter method along with indexOf to eliminate duplicate elements.
```javascript
const uniqueArray = array.filter((element, index) => array.indexOf(element) === index);
```
3) Using Reduce Method:
Utilize the reduce method to only keep unique elements in the resulting array.
```javascript
const uniqueArray = array.reduce((accumulator, currentValue) => {
if (accumulator.indexOf(currentValue) === 1) {
accumulator.push(currentValue);
}
return accumulator;
}, []);
```
4) Using forEach Method:
Iterate through the array using forEach loop and check if element already present in the result array.
```javascript
const uniqueArray = [];
array.forEach((element) => {
if (!uniqueArray.includes(element)) {
uniqueArray.push(element);
}
});
```
5) Using ES6 Map:
Use ES6 Map to remove duplicates by storing elements as keys.
```javascript
const uniqueArray = […new Map(array.map(item => [item, item])).values()];
```
6) Using ES6 Set and Spread Operator:
Another way to utilize Set along with Spread Operator to remove duplicates.
```javascript
const uniqueArray = […new Set(array)];
```
7) Using ES6 indexOf and filter:
A method that uses indexOf and filter functions in ES6 to remove duplicate elements.
```javascript
const uniqueArray = array.filter((element, index) => array.indexOf(element) === index);
```
8) Using lodash Library:
Lodash library provides a unique function to easily remove duplicates from an array.
```javascript
const uniqueArray = _.uniq(array);
```
9) Using Reduce and includes Method:
This method combines reduce method with includes to filter out duplicate elements.
```javascript
const uniqueArray = array.reduce((accumulator, currentValue) => {
if (!accumulator.includes(currentValue)) {
accumulator.push(currentValue);
}
return accumulator;
}, []);
```
10) Using Object for deduplication:
Create an object with unique keys from the array and then extract them back to an array.
```javascript
const uniqueArray = Object.keys(array.reduce((obj, item) => {
obj[item] = true;
return obj;
}, {}));
```
11) Training Program for Students:
Design a training program that covers these various techniques of removing duplicate elements from an array in JavaScript.
Include hands on coding exercises for students to practice each method.
Provide real world scenarios where removal of duplicates from an array is crucial.
Encourage students to explore and compare the efficiency of each method in terms of time complexity.
Offer guidance on when to choose one method over the other based on the size and type of the array.
Provide sample arrays with duplicates for students to apply the learned techniques and validate their understanding.
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