Swift control flow with stride

Question

What is the difference between two stride function?

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

While go through the tutorial, Control flow with stride i found that two types of stride function as per my knowledge both working like a same, i don't know what is the difference between them hence anyone can explain?

Use the stride(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)
}

Using stride(from:through:by:) instead:

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)
}

Change `to` to `through` in the first example and change `through` to `to` in the second. Note the difference. And read the documentation. Note the difference. — rmaddy, Mar 16 '18 at 04:16

score 3 · Accepted Answer · answered Mar 16 '18 at 04:19

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.

Notice the difference in bold text.

It's the difference between a closed range like [0...10] and an open range like [0..<10].

Swift control flow with stride

1 Answers1