Swift 用步幅控制流程

Question

两个步幅函数有什么区别？

stride(from:to:by) & (from:through:by)

在学习本教程时，Control flow with stride 我发现据我所知，两种类型的步幅功能都一样，我不知道它们之间有什么区别，因此有人可以解释一下吗？

使用步幅(from:to:by:)

let minutes = 60
let minuteInterval = 5
for tickMark in stride(from: 0, to: minutes, by: minuteInterval) {
    // render the tick mark every 5 minutes (0, 5, 10, 15 ... 45, 50, 55)
}

改为使用 stride(from:through:by:)：

let hours = 12
let hourInterval = 3
for tickMark in stride(from: 3, through: hours, by: hourInterval) {
    // render the tick mark every 3 hours (3, 6, 9, 12)
}

Answer 1

stride(from:through:by:):

Returns the sequence of values (self, self + stride, self + 2 * stride, … last) where last is the last value in the progression less than or equal to end.

stride(from:to:by:):

Returns the sequence of values (self, self + stride, self + 2 * stride, … last) where last is the last value in the progression that is less than end.

请注意粗体文本的区别。

这是封闭区间[0...10]和开放区间[0..<10]的区别。

Swift 用步幅控制流程

Swift control flow with stride

control-flow

stride

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