Not Nil Challenge

if let _ = value or if value != nil? Comparing performance of not nil syntax variations.

Usage

Run the command below and compare the results.

$ swift test

Modify attempts property in NotNilChallengeTests class to check performance for more / fewer runs.

Test Environment

• Device: MacBook Pro (15-inch, Mid 2015, 2.2GHz Intel Core i7, 16GB RAM)
• OS: macOS High Sierra 10.13.3
• Swift: 4.1.2
• Attempts: 10,000,000

Test Results

Variant	Average duration
if let _ = value	0.165 sec
if value != nil	0.184 sec

Conclusions

if let _ = value is about 12% faster than if value != nil.