if
expressions
You use if
expressions exactly like if
statements in other languages:
In addition, you can use if
as an expression. The last expression of each block becomes the value of the if
expression:
Speaker Notes
This slide should take about 4 minutes.
Because if
is an expression and must have a particular type, both of its branch blocks must have the same type. Show what happens if you add ;
after "small"
in the second example.
An if
expression should be used in the same way as the other expressions. For example, when it is used in a let
statement, the statement must be terminated with a ;
as well. Remove the ;
before println!
to see the compiler error.