Run results for: Determining if a variable is an object

Compares three ways of determining if a variable is an object. - Check if object by comparing value to an object instantiated from the value - Using typeof - Using instanceof

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Check if object by using typeof - passing in an object

111.8M/s

Check if object by using instanceof - passing in a string

111.5M/s

Check if object by using typeof - passing in a string object

111.3M/s

Check if object by using instanceof - passing in an integer

110.4M/s

Check if object by using typeof - passing in an integer

106.6M/s

Check if object by using instanceof - passing in an object

106.3M/s

Check if object by using typeof - passing in a string

105.9M/s

Check if object by using instanceof - passing in a string object

103.9M/s

Check if object by comparing value to an object instantiated from the value - passing in a string object

92.0M/s

Check if object by comparing value to an object instantiated from the value - passing in an object

85.7M/s

Check if object by comparing value to an object instantiated from the value - passing in an integer

39.1M/s

Check if object by comparing value to an object instantiated from the value - passing in a string

24.0M/s

View exact numbers

Test name	Executions per second
✓ Check if object by using typeof - passing in an object	111,777,392 Ops/sec
Check if object by using instanceof - passing in a string	111,459,712 Ops/sec
Check if object by using typeof - passing in a string object	111,329,752 Ops/sec
Check if object by using instanceof - passing in an integer	110,433,136 Ops/sec
Check if object by using typeof - passing in an integer	106,585,528 Ops/sec
Check if object by using instanceof - passing in an object	106,306,920 Ops/sec
Check if object by using typeof - passing in a string	105,941,016 Ops/sec
Check if object by using instanceof - passing in a string object	103,888,552 Ops/sec
Check if object by comparing value to an object instantiated from the value - passing in a string object	91,958,856 Ops/sec
Check if object by comparing value to an object instantiated from the value - passing in an object	85,745,888 Ops/sec
Check if object by comparing value to an object instantiated from the value - passing in an integer	39,073,036 Ops/sec
Check if object by comparing value to an object instantiated from the value - passing in a string	24,024,328 Ops/sec

Script Preparation code:

let objVal = {
  "a" : "a",
  "b" : "b"
};

let strObjVal = new String("hello");

let strVal = "hello";

let intVal = 23;

Tests:

Check if object by comparing value to an object instantiated from the value - passing in an object
let isObject = (objVal == Object(objVal) && !(objVal instanceof String));
Check if object by comparing value to an object instantiated from the value - passing in a string
let isObject = (strVal == Object(strVal) && !(strVal instanceof String));
Check if object by comparing value to an object instantiated from the value - passing in a string object
let isObject = (strObjVal == Object(strObjVal) && !(strObjVal instanceof String));
Check if object by comparing value to an object instantiated from the value - passing in an integer
let isObject = (intVal == Object(intVal) && !(intVal instanceof String));
Check if object by using instanceof - passing in an object
let isObject = (objVal instanceof Object && !(objVal instanceof String));
Check if object by using instanceof - passing in a string
let isObject = (strVal instanceof Object && !(strVal instanceof String));
Check if object by using instanceof - passing in a string object
let isObject = (strObjVal instanceof Object && !(strObjVal instanceof String));
Check if object by using instanceof - passing in an integer
let isObject = (intVal instanceof Object && !(intVal instanceof String));
Check if object by using typeof - passing in an object
let isObject = (typeof objVal != "object" && !(objVal instanceof String));
Check if object by using typeof - passing in a string
let isObject = (typeof strVal != "object" && !(strVal instanceof String));
Check if object by using typeof - passing in a string object
let isObject = (typeof strObjVal != "object" && !(strObjVal instanceof String));
Check if object by using typeof - passing in an integer
let isObject = (typeof intVal != "object" && !(intVal instanceof String));