Tour · 8 of 25

if, match, and loops produce values, so a name is set once on every path

Where if is a statement, you declare an empty variable and assign it in each branch, and a branch you forget leaves it unset. In hd, if, match, and blocks are expressions: speed := takes the value of whichever branch runs, so there is nothing to forget. A loop can produce a value too: break value ends it early with that value, and the loop's else gives the value when it runs to the end without a break. No flag variable, no sentinel. Those are all the loops there are: for, and while with a condition. There is no loop keyword, so an endless loop is written while true: and left with break.

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