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Run results for: Map.set() vs Object assignment in loops

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
Chrome 97
Mac OS X 10.15.7
Desktop
3 years ago
Test name Executions per second
for-loop + Map.set 9.4 Ops/sec
for-loop + Object assignment 43.4 Ops/sec
forEach + Map.set 5.4 Ops/sec
forEach + Object assignment 22.1 Ops/sec
Tests:

  • for-loop + Map.set

    ​x
     
    const obj = {}
    const map = new Map()
    const n = 1000000;
    ​
    for (let i = 0; i < n; i++) {
      map.set(i, i);
    }

  • for-loop + Object assignment

     
    const obj = {}
    const map = new Map()
    const n = 1000000;
    ​
    for (let i = 0; i < n; i++) {
      obj[i] = i;
    }

  • forEach + Map.set

     
    const obj = {}
    const map = new Map()
    const n = Array(1000000).fill(0)
    ​
    n.forEach((value, index) => {
      map.set(index, index);
    })

  • forEach + Object assignment

     
    const obj = {}
    const map = new Map()
    const n = Array(1000000).fill(0)
    ​
    n.forEach((value, index) => {
      obj[index] = index;
    })