range iterates over elements in a variety of data
structures. Let’s see how to use
range with some
of the data structures we’ve already learned.
Here we use
range to sum the numbers in a slice.
Arrays work like this too.
range on arrays and slices provides both the
index and value for each entry. Above we didn’t
need the index, so we ignored it with the
_. Sometimes we actually want
the indexes though.
range on map iterates over key/value pairs.
range can also iterate over just the keys of a map.
range on strings iterates over Unicode code
points. The first value is the starting byte index
rune and the second the
Next example: List Comprehension