Convert an array to set in JavaScript

This post will discuss how to convert an array to set in JavaScript.

1. Using Set constructor

The recommended solution is to pass the array to the set constructor, which accepts an iterable object. This is demonstrated below:

var arr = [ 1, 3, 2, 3, 5 ];

var set = new Set(arr);

console.log(set);

Output: Set { 1, 3, 2, 5 }

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2. Using `Array.prototype.map()` function

The map() method can also be used to transform a regular array into a set:

var arr = [ 1, 3, 2, 3, 5 ];

var set = new Set();

arr.map(item => set.add(item));

console.log(set);

Output: Set { 1, 3, 2, 5 }

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To convert an array of objects to a set, you can use the map() method in the following manner:

var people = [

{ name: 'Josh', age: 15 },

{ name: 'Mark', age: 25 },

{ name: 'Tim', age: 20 },

{ name: 'Bob', age: 30 }

];

var set = new Set(people.map(item => item.name));

console.log(set);

Output: Set { 'Josh', 'Mark', 'Tim', 'Bob' }

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3. Using `Array.prototype.forEach()` function

Another solution is to individually add each array element to the set object. This can be easily done using the forEach() method, as shown below:

var arr = [ 1, 3, 2, 3, 5 ];

var set = new Set();

arr.forEach(item => set.add(item));

console.log(set);

Output: Set { 1, 3, 2, 5 }

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4. Using `Array.prototype.reduce()` function

Finally, you can use the reduce() method in the following manner to transform an array into a set.

var arr = [ 1, 3, 2, 3, 5 ];

var set = new Set();

arr.reduce((_, e) => set.add(e), null);

console.log(set);

Output: Set { 1, 3, 2, 5 }

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That’s all about converting an array to a set in JavaScript.

Convert an array to set in JavaScript

1. Using Set constructor

2. Using Array.prototype.map() function

3. Using Array.prototype.forEach() function

4. Using Array.prototype.reduce() function

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2. Using `Array.prototype.map()` function

3. Using `Array.prototype.forEach()` function

4. Using `Array.prototype.reduce()` function