Lookup of map vs object
Tests the speed of accessing an item by object key vs array index.
Based on question on http://stackoverflow.com/questions/1232040/how-do-i-empty-an-array-in-javascript
Compare the new ES6 spread operator with the traditional concat() method
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New benchmark Your benchmarks
Source code: GitHub/MeasureThat.net
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Based on: Benchmark.js (v2.1.1)
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