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Run results for:
instanceof vs typeof vs prop check
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36 Edg/138.0.0.0
Browser:
Chrome 138
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
instanceof
67.0M/s
typeof no function
66.4M/s
typeof and test attribute
65.8M/s
typeof
62.4M/s
View exact numbers
Test name
Executions per second
✓
instanceof
67,041,096 Ops/sec
typeof no function
66,435,056 Ops/sec
typeof and test attribute
65,773,104 Ops/sec
typeof
62,435,656 Ops/sec
Script Preparation code:
var obj = {a:2};
Tests:
instanceof
obj instanceof Object
typeof
typeof obj === 'object'
typeof no function
typeof obj === 'object' && typeof obj !== 'function'
typeof and test attribute
obj.a