Created
January 3, 2019 08:34
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const nonUniqueArr = [1,2,3,4,5,4,3,5,6]; | |
const indexOfUnique = (arr) => arr | |
.filter((item, index, a) => a.indexOf(item) === index); | |
const newSetUnique = (arr) => [...new Set(arr)]; | |
const fromUnique = (arr) => Array.from(new Set(arr)); | |
const seenUnique = (arr) => { | |
const seen = new Set(); | |
arr.filter(i => { | |
if (seen.has(i)) return false; | |
seen.add(i); | |
return true; | |
}); | |
return seen; | |
} | |
console.time('indexOf'); | |
let i = 0 | |
let res; | |
while(i++ < 1e6) res = indexOfUnique(nonUniqueArr); | |
console.log(res); | |
console.timeEnd('indexOf'); | |
console.time('new set'); | |
i = 0 | |
while(i++ < 1e6) res = newSetUnique(nonUniqueArr) | |
console.log(res); | |
console.timeEnd('new set'); | |
console.time('from'); | |
i = 0 | |
while(i++ < 1e6) res = fromUnique(nonUniqueArr) | |
console.log(res); | |
console.timeEnd('from'); | |
console.time('seen'); | |
i = 0 | |
while(i++ < 1e6) res = seenUnique(nonUniqueArr); | |
console.log(res); | |
console.timeEnd('seen'); |
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