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immutable

Immutable Data Collections

  • 3.7.4
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  • npm
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What is immutable?

The immutable npm package provides persistent immutable data structures that do not change once created, enabling advanced memoization, change detection, and functional programming techniques. It offers a variety of data structures such as List, Map, Set, and Record.

What are immutable's main functionalities?

Persistent Immutable List

Create and manipulate immutable lists, where modifications return new lists without altering the original.

const { List } = require('immutable');
const list1 = List([1, 2, 3]);
const list2 = list1.push(4);
console.log(list1.size); // 3
console.log(list2.size); // 4

Persistent Immutable Map

Create and manipulate immutable maps, with key-value pairs. Changes produce new maps without changing the original.

const { Map } = require('immutable');
const map1 = Map({ a: 1, b: 2, c: 3 });
const map2 = map1.set('b', 50);
console.log(map1.get('b')); // 2
console.log(map2.get('b')); // 50

Persistent Immutable Set

Create and manipulate immutable sets, which are collections of unique values. Adding existing values does not change the set.

const { Set } = require('immutable');
const set1 = Set([1, 2, 3]);
const set2 = set1.add(3).add(4);
console.log(set1.has(3)); // true
console.log(set2.has(4)); // true

Record Factory

Define 'Record' factories to create immutable records with default values and specific shapes.

const { Record } = require('immutable');
const Person = Record({ name: null, age: null });
const person1 = new Person({ name: 'Alice', age: 30 });
const person2 = person1.set('name', 'Bob');
console.log(person1.name); // Alice
console.log(person2.name); // Bob

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Package last updated on 17 Jun 2015

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