Run results for: check property existence

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

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

Benchmark engine: Benchmark.js

check before access

99.2M/s

access or missing

98.6M/s

View exact numbers

Test name	Executions per second
✓ check before access	99,238,768 Ops/sec
access or missing	98,584,840 Ops/sec

Script Preparation code:

const obj = {
  string: 'string',
  number: 7,
  boolean: true,
};

Tests:

access or missing
obj.string ?? false; obj.number ?? false; obj.boolean ?? false; obj.never ?? false;
check before access
'string' in obj && obj.string; 'number' in obj && obj.number; 'boolean' in obj && obj.boolean; 'never' in obj && obj.never;