Run results for: Fastest way to double check value.

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Browser: Chrome 54

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
1	1632417.0 Ops/sec
2	437025.8 Ops/sec
3	160360.6 Ops/sec

HTML Preparation code:

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var a = $('#a');
var c = $('#c');

Tests:

1
a = $('#a');
2
if(a.find('#b').length === 0) { a = $('#a'); }
3
if(a.find('#d').length === 0) { c = $('#c'); }