Run results for: For Loop vs Slice for searching for needle in haystack in small array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:141.0) Gecko/20100101 Firefox/141.0

Browser: Firefox 141

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

For loop

26.6M/s

Slice

9.0M/s

View exact numbers

Test name	Executions per second
✓ For loop	26,566,930 Ops/sec
Slice	9,045,150 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

const arraySize = 200; // Size of the array
const array = Array.from({ length: arraySize }, (_, i) => i); // Array of numbers from 0 to arraySize - 1

const randomIndex = Math.floor(Math.random() * (arraySize - 1)); // Random index in the array
const needle = array[randomIndex + Math.floor(Math.random() * (arraySize - randomIndex - 1)) + 1]; // Needle after the random index

Tests:

For loop
let foundIndex = -1; for (let i = randomIndex + 1; i < array.length; i++) { if (array[i] === needle) { foundIndex = i; break; } }
Slice
const slicedArray = array.slice(randomIndex + 1); const foundIndexInSlice = slicedArray.indexOf(needle); const foundIndex = foundIndexInSlice !== -1 ? foundIndexInSlice + randomIndex + 1 : -1;