Run results for: Reduce + findIndex vs Loops + Object.values()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.0 Safari/605.1.15

Browser: Safari 17

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
reduce + findIndex	1187.7 Ops/sec
Loops + Object.keys	3139.2 Ops/sec

Tests:

reduce + findIndex
const movies = Array.from({ length: 50 }).map(() => ({ characters: Array.from({ length: 50 }).map((_, i) => ({ id: Math.floor(Math.random() * 100), })), })); const mergedCharacters = movies.reduce( (characters, movie) => characters.concat(movie.characters), [] ); const uniqueCharacters = mergedCharacters.filter( (character, index) => mergedCharacters.findIndex((mCharacter) => mCharacter.id === character.id) === index );
Loops + Object.keys
const movies = Array.from({ length: 50 }).map(() => ({ characters: Array.from({ length: 50 }).map((_, i) => ({ id: Math.floor(Math.random() * 100) })) })) const uniqueCharacters = {} for (let i = 0; i < movies.length; i++) { for (let j = 0; j < movies[i].characters.length; j++) { uniqueCharacters[movies[i].characters[j].id] = movies[i].characters[j]; } } const characters = Object.values(uniqueCharacters);