Run results for: Map string versus number keys (1000 entries)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 6 months ago

Test name	Executions per second
string map	5783.4 Ops/sec
int map	2723.7 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var intMap = new Map();
var stringMap = new Map();

// arrays of keys so they don't have to construct them in the test cases
var stringKeys = [];
var intKeys = [];

for (let i = 0; i < 1000; i++) {
    // identical values
    var value = "test123" + i.toString()
    intMap.set(i, value);
    intKeys.push(i);
    stringMap.set(i.toString(), value);
    stringKeys.push(i.toString());
}

function shuffle(array) {
  let currentIndex = array.length;

  // While there remain elements to shuffle...
  while (currentIndex != 0) {

    // Pick a remaining element...
    let randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex--;

    // And swap it with the current element.
    [array[currentIndex], array[randomIndex]] = [
      array[randomIndex], array[currentIndex]];
  }
}

// for the tests later
var stringOutputValues = [];
var intOutputValues = [];

// shuffle the arrays so they don't benefit from any order advantages
shuffle(stringKeys);
shuffle(intKeys);

Tests:

string map
let i = 0; for (const stringKey of stringKeys) { // do (identical) work w/ the values so there's no optimisation. // adds [accessNum, value concat accessNum] to the stringOutputValues array stringOutputValues.push([i.toString(), stringMap.get(stringKey) + i.toString()]); i++; }
int map
let i = 0; for (const intKey of intKeys) { // do (identical) work w/ the values so there's no optimisation. // adds [accessNum, value concat accessNum] to the intOutputValues array intOutputValues.push([i.toString(), intMap.get(intKey) + i.toString()]); i++; }

Run results for: Map string versus number keys (1000 entries)

tests the performance of string vs number keys in a map

string map

int map