nodejs-array-unique

Another implementation of jonschlinkert/array-unique, which is faster on larger arrays

Install

Install with npm:

npm install --save wwa-array-unique

Usage

const unique = require('wwa-array-unique');

let arr = ['a', 'b', 'c', 'c'];
console.log(unique(arr)) //=> ['a', 'b', 'c']
console.log(arr)         //=> ['a', 'b', 'c']

/* The above modifies the input array. To prevent that: */
const unique = require("array-unique").immutable;

let arr = ['a', 'b', 'c', 'c'];
console.log(unique(arr)) //=> ['a', 'b', 'c']
console.log(arr)         //=> ['a', 'b', 'c', 'c']

Benchmarks

Table values are number of operations per second. Unlike the original version, my implementation of immutable is faster than unique.

NodeJS 6

	array-unique (mutable)	wwa-array-unique (mutable)	array-unique (immutable)	wwa-array-unique (immutable)
10	2,764,501	315,991	2,239,566	1,119,888
20	888,532	202,232	726,592	590,641
100	65,662	68,415	53,382	208,231
1,000	67,716	71,174	53,714	202,922
10,000	3,025	26,326	2,519	48,769

NodeJS 8

	array-unique (mutable)	wwa-array-unique (mutable)	array-unique (immutable)	wwa-array-unique (immutable)
10	2,013,162	1,569,884	1,616,899	2,259,815
20	1,026,325	887,556	774,410	1,168,428
100	80,493	177,247	58,954	198,410
1,000	76,875	165,295	58,541	192,993
10,000	3,760	36,623	2,866	46,911

NodeJS 11

	array-unique (mutable)	wwa-array-unique (mutable)	array-unique (immutable)	wwa-array-unique (immutable)
10	7,346,026	1,902,676	5,013,364	4,984,386
20	1,230,241	996,985	1,132,996	1,595,666
100	60,376	189,206	59,443	222,805
1,000	56,450	208,546	56,999	240,402
10,000	2,830	38,446	2,726	49,699