Run results for: Random I/O various arrays

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
mixed use array	163.3 Ops/sec
single use array	10578.7 Ops/sec
typed array	9867.9 Ops/sec

Script Preparation code:

var a1 = new Array(100000);
var a2 = new Array(100000);
var a3 = new Float64Array(100000);

for (let i = 0; i < 100000; ++i) {
  const x = Math.random();
  a1[i] = x < 0.5 ? Math.random().toString() : x;
  a2[i] = Math.random();
  a3[i] = Math.random();
}

Tests:

mixed use array
for (let i = 0; i < 10000; ++i) { const m = (Math.random() * 10000) | 0; a1[m] = a1[m] + Math.random(); }
single use array
for (let i = 0; i < 10000; ++i) { const m = (Math.random() * 10000) | 0; a2[m] = a2[m] + Math.random(); }
typed array
for (let i = 0; i < 10000; ++i) { const m = (Math.random() * 10000) | 0; a3[m] = a3[m] + Math.random(); }

Run results for: Random I/O various arrays

mixed use array

single use array

typed array