Run results for: Array HashMap comparison

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
HashMap#in	9285506.0 Ops/sec
HashMap#property	9444617.0 Ops/sec
HashMap#hasOwnProperty	8274795.0 Ops/sec
Array#includes	10811920.0 Ops/sec
Array#indexOf	2311393.0 Ops/sec

Script Preparation code:

const long_text = "the the the the the Ladies others the six desire age. Bred am soon park past read by lain. As excuse eldest no moment. An delight beloved up garrets am cottage private. The far attachment discovered celebrated decisively surrounded for and. Sir new the particular frequently \
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assistance me especially. For looking two cousins regular amongst. \
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const words = long_text.split(/\s+/);
var array = [];
var hashMap = {};
for (let word of words) {
  array.push(word);
  hashMap[word]= (hashMap[word] || 0) + 1;
}

Tests:

HashMap#in
const result = 'Impression' in hashMap;
HashMap#property
const result = hashMap.Impression;
HashMap#hasOwnProperty
const result = hashMap.hasOwnProperty('Impression');
Array#includes
const result = array.includes('Impression');
Array#indexOf
const result = array.indexOf('Impression') !== -1;

Run results for: Array HashMap comparison

HashMap#in

HashMap#property

HashMap#hasOwnProperty

Array#includes

Array#indexOf