Run results for: Deduplicate array test v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.81 Safari/537.36

Browser: Chrome 104

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Map + filter + includes	886232.9 Ops/sec
forEach	1021907.7 Ops/sec
for	1111789.5 Ops/sec
for with saved length	1136411.0 Ops/sec

Tests:

Map + filter + includes
const deduplicateArrayByKey = (array, key) => { const arrayOfKeys = array.map((item) => item[key]); return array.filter( (item, index) => !arrayOfKeys.includes(item[key], index + 1) ); } let testArray = [{ id: "1" }, { id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" }]; return deduplicateArrayByKey(testArray, "id");
forEach
const deduplicateArrayByKey2 = (array, key) => { const seen = {}; const result = []; array.forEach((item) => { if (!seen[item[key]]) { result.push(item); seen[item[key]] = true; } }) return result; } let testArray = [{ id: "1" }, { id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" }]; return deduplicateArrayByKey2(testArray, "id");
for
const deduplicateArrayByKey3 = (array, key) => { const seen = {}; const result = []; for (let i = 0; i < array.length; i++) { const item = array[i]; if (!seen[item[key]]) { result.push(item); seen[item[key]] = true; } } return result; } let testArray = [{ id: "1" }, { id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" }]; return deduplicateArrayByKey3(testArray, "id");
for with saved length
const deduplicateArrayByKey4 = (array, key) => { const seen = {}; const result = []; const len = array.length; for (let i = 0; i < len; i++) { const item = array[i]; if (!seen[item[key]]) { result.push(item); seen[item[key]] = true; } } return result; } let testArray = [{ id: "1" }, { id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" },{ id: "1" }]; return deduplicateArrayByKey4(testArray, "id");

Run results for: Deduplicate array test v2

Map + filter + includes

forEach

for

for with saved length