Swift if let

Essentially the line is saying, "if you can let the new variable name equal the non-optional version of optionalName, do the following with it". As Martin pointed out, this is called Optional Binding.

The sole purpose of it is to test if an optional variable contains an actual value and bind the non-optional form to a temporary variable. This is the safe way to "unwrap" an optional or in other words, access the value contained in the optional. It is in no way testing for equality of any kind. It is only testing for the existence of a value within an optional.

Similar codes

0 vote90 views1 answer
Swift sleep milliseconds
Swift
0 vote154 views1 answer
Xcode combine calayer into an image
Swift
0 vote163 views1 answer
Swift weekday component values
Swift
1 vote108 views1 answer
How to get image from pdf swift
Swift
16 votes281 views4 answers
FontFamily
Swift
1 vote138 views1 answer
IOS 10.3.1 Simulator manually
Swift
0 vote138 views1 answer
Reload data
Swift
0 vote144 views1 answer
Circular array swift
Swift
1 vote165 views1 answer
Swift set view visible
Swift
1 vote90 views1 answer
Ionic Library not found for -lGoogleToolboxForMac
Swift