Javascript: what lookup is faster: array.indexOf vs object hash?

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Object key lookup is faster than Array.indexOf(). You can check it on jsperf.

Test Results:

Array

Index of 10000 items: 26,547 Operations/sec

Index of 100000 items: 2,493 Operations/sec

Object

Lookup key of 10000 items: 152,115 Operations/sec

Lookup key of 100000 items: 150,450 Operations/sec

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