Run results for: String indexing vs array indexing for string concatenation

Test name	Executions per second
✓ Split create char Array + Array Indexing concatenation	2,070,137 Ops/sec
Array Indexing + concatenate string	1,773,318 Ops/sec
String Indexing: with .charAt() + concatenate string	1,674,440 Ops/sec
String Indexing: with array index + concatenate string	1,657,360 Ops/sec
Array Indexing: with array index + concatenate string foreach	1,568,695 Ops/sec
Array Indexing: with array index + concatenate string while decrement	1,502,375 Ops/sec
String Indexing: with .slice() + concatenate string	1,308,943 Ops/sec
String Indexing: with .at() + concatenate string	1,076,967 Ops/sec
Create loop Char Array + Array Indexing concatenation	648,656 Ops/sec

Test name

Executions per second

✓ Split create char Array + Array Indexing concatenation

2,070,137 Ops/sec

Array Indexing + concatenate string

1,773,318 Ops/sec

String Indexing: with .charAt() + concatenate string

1,674,440 Ops/sec

String Indexing: with array index + concatenate string

1,657,360 Ops/sec

Array Indexing: with array index + concatenate string foreach

1,568,695 Ops/sec

Array Indexing: with array index + concatenate string while decrement

1,502,375 Ops/sec

String Indexing: with .slice() + concatenate string

1,308,943 Ops/sec

String Indexing: with .at() + concatenate string

1,076,967 Ops/sec

Create loop Char Array + Array Indexing concatenation

648,656 Ops/sec

Tests:

Array Indexing + concatenate string
let output = '' for(let i = 0; i < array.length; i++){ output += array[ i ]; }
String Indexing: with array index + concatenate string
let output = '' for(let i = 0; i < string.length; i++){ output += string[ i ]; }
Create loop Char Array + Array Indexing concatenation
const charArray = []; for(let i = 0; i < string.length; i++){ charArray.push(string[ i ]); } let output = '' for(let i = 0; i < charArray.length; i++){ output += charArray[ i ]; }
Split create char Array + Array Indexing concatenation
const charArray = string.split(''); let output = '' for(let i = 0; i < charArray.length; i++){ output += charArray[ i ]; }
String Indexing: with .charAt() + concatenate string
let output = '' for(let i = 0; i < string.length; i++){ output += string.charAt(i); }
String Indexing: with .at() + concatenate string
let output = '' for(let i = 0; i < string.length; i++){ output += string.at(i); }
String Indexing: with .slice() + concatenate string
let output = '' for(let i = 1; i <= string.length; i++){ output += string.slice(i - 1, i); }
Array Indexing: with array index + concatenate string foreach
let output = '' for(const char of array){ output += array[i] }
Array Indexing: with array index + concatenate string while decrement
let output = '' let index = array.length; while (--index){ output += array[array.length - 1 - i] }