Benchmark: Sparse Array Vs. Object, Map, Set, Number Indexes vs alpha indexes

Script Preparation code:

var iterations =10000;
var step = 10;

Tests:

Object
const obj = {}; for(let i=0;i<iterations;i+=step){ obj[i]= i; obj[i+1]=obj[i]+1; }
Array
const arr = []; for(let i=0;i<iterations;i+=step){ arr[i]=i; arr[i+1]= arr[i]+1; }
Set Length Array
const setLengthArr = new Array(iterations); for(let i=0;i<iterations;i+=step){ setLengthArr[i]=i; setLengthArr[i+1] = setLengthArr[i]+1; }
TypedArray
const typedArray = new Uint32Array(iterations); for(let i=0;i<iterations;i+=step){ typedArray[i]=i; typedArray[i+1]= typedArray[i]+1; }
map
const map = new Map(); for(let i=0;i<iterations;i+=step){ map.set(i,i); map.set(i+1,map.get(i)+1) }
set
const set = new Set(); for(let i=0;i<iterations;i+=step){ set.add(i); set.add(set.has(i) && i) }
Object Alpha index
const obj = {}; for(let i=0;i<iterations;i+=step){ const val = 'a' + i; obj[val]= val; obj[i+1]=obj[val]; }
Array numeric index
const arr = []; for(let i=0;i<iterations;i+=step){ const val = 'a' + i; arr[i]= val; arr[i+1]=arr[i]; }

Rendered benchmark preparation results:

Previous results

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Latest run results:

Run details: (Test run date: 11 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.0.0 Safari/537.36

Browser/OS: Chrome 113 on Mac OS X 10.15.7

Sparse Array Vs. Object, Map, Set, Number Indexes vs alpha indexes (version: 0)