Benchmark: Test Build - MeasureThat.net

Tests:

Ternaries
const localityList = ["us", "eu", "au", "jp"]; const max = localityList.length - 1; let returnStr = ''; for (const [index, region] of localityList.entries()) { returnStr += index === max ? `, or ${region}` : `${index !== 0 ? ', ' : ''}${region}`; } return returnStr;
Map/Join/Replace
const localityList = ["us", "eu", "au", "jp"]; return localityList .map(item => `${item}`) .join(', ') .replace(/(,)(?!.*,)/sg, ', or');

Rendered benchmark preparation results:

Previous results

Test case name	Result
Ternaries
Map/Join/Replace

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:82.0) Gecko/20100101 Firefox/82.0

Browser/OS: Firefox 82 on Windows 7

Test name	Executions per second
Ternaries	2442250.0 Ops/sec
Map/Join/Replace	1012681.0 Ops/sec

Test Build (version: 0)