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# Vijay => To test the performance of lodash groupby vs native JS groupby implementation
To test if native js implementation is better compared to Lodash
Go to the benchmark
Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=485929" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 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
groupBy
30325.4 Ops/sec
Native JS GroupBy
443201184.0 Ops/sec
HTML Preparation code:
<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/lodash@4.17.15/lodash.min.js"></script>
Script Preparation code:
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Tests:
groupBy
function prepData(d) { let retObj = {}; retObj.storeNbr = d.storeNbr; retObj[d.ruleType] = d.ruleType; return retObj; }; let _groupedData = []; _groupedData = _.groupBy(data, function(value) { return ( value.storeNbr + "#" + value.ruleType ); }); _.map(_groupedData, prepData);
Native JS GroupBy
var groupBy = function(xs, key) { return xs.reduce(function(rv, x) { (rv[x[key]] = rv[x[key]] || []).push(x); return rv; }, {}); };