Run results for: For Of vs Spread

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:143.0) Gecko/20100101 Firefox/143.0

Browser: Firefox 143

Operating system: Windows

Device Platform: Desktop

Date tested: 10 months ago

Using For-Of Loops

23/s

Using Spread

23/s

View exact numbers

Test name	Executions per second
✓ Using For-Of Loops	23 Ops/sec
Using Spread	23 Ops/sec

HTML Preparation code:

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

Script Preparation code:

// Mock handler sets
const navigationHandlers = Array.from({ length: 50000 }, (_, i) => [`nav-${i}`, () => i]);
const titlebarHandlers   = Array.from({ length: 50000 }, (_, i) => [`title-${i}`, () => i]);
const tabHandlers        = Array.from({ length: 50000 }, (_, i) => [`tab-${i}`, () => i]);

function createSyncHandlerMap_loops() {
  const map = new Map();

  for (const [msg, h] of navigationHandlers) map.set(msg, h);
  for (const [msg, h] of titlebarHandlers)   map.set(msg, h);
  for (const [msg, h] of tabHandlers)        map.set(msg, h);

  return map;
}

function createSyncHandlerMap_spread() {
  return new Map([
    ...navigationHandlers,
    ...titlebarHandlers,
    ...tabHandlers,
  ]);
}

Tests:

Using For-Of Loops
const map = createSyncHandlerMap_loops();
Using Spread
const map = createSyncHandlerMap_spread();

Run results for: For Of vs Spread

Comparing the spread operater vs a for - of loop

Using For-Of Loops

Using Spread