for
The for
loop iterates over ranges of values or the items in a collection:
Speaker Notes
- Under the hood
for
loops use a concept called “iterators” to handle iterating over different kinds of ranges/collections. Iterators will be discussed in more detail later. - 请注意,
for
循环只迭代到4
。现在展示使用1..=5
语法表示一个包含边界的范围。