"Type of undefined" vs "=== undefined" (v41)

Revision 41 of this benchmark created on

Setup

bob = { a: 1, b: true, c: "c", d: [], e: {} };

Test runner

Ready to run.

Testing in
TestOps/sec
typeof undefined
typeof bob.a === 'undefined';
typeof bob.b === 'undefined';
typeof bob.c === 'undefined';
typeof bob.d === 'undefined';
typeof bob.e === 'undefined';
ready
=== undefined
bob.a === undefined;
bob.b === undefined;
bob.c === undefined;
bob.d === undefined;
bob.e === undefined;
 
ready
== null
bob.a == null;
bob.b == null;
bob.c == null;
bob.d == null;
bob.u == null;
ready
void 0
bob.a === void 0;
bob.b === void 0;
bob.c === void 0;
bob.d === void 0;
bob.e === void 0;
ready
typeof u
typeof bob.a[0] === 'u';
typeof bob.b[0] === 'u';
typeof bob.c[0] === 'u';
typeof bob.d[0] === 'u';
typeof bob.e[0] === 'u';
 
ready
!
!bob.a;
!bob.b;
!bob.c;
!bob.d;
!bob.e;
ready
!hasOwnProperty
!bob.hasOwnProperty('a');
!bob.hasOwnProperty('b');
!bob.hasOwnProperty('c');
!bob.hasOwnProperty('d');
!bob.hasOwnProperty('e');
ready
length
(typeof bob.a).length === 9;
(typeof bob.b).length === 9;
(typeof bob.c).length === 9;
(typeof bob.d).length === 9;
(typeof bob.e).length === 9;
 
ready

Revisions

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