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primitive_types4 solution
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4 changed files with 28 additions and 9 deletions
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@ -1,5 +1,5 @@
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fn main() {
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// TODO: Create an array with at least 100 elements in it where the ??? is.
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// TODO: Create an array called `a` with at least 100 elements in it.
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// let a = ???
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if a.len() >= 100 {
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@ -1,18 +1,15 @@
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// Get a slice out of Array a where the ??? is so that the test passes.
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn slice_out_of_array() {
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let a = [1, 2, 3, 4, 5];
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let nice_slice = ???
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// TODO: Get a slice called `nice_slice` out of the array `a` so that the test passes.
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// let nice_slice = ???
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assert_eq!([2, 3, 4], nice_slice);
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}
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@ -267,8 +267,8 @@ dir = "04_primitive_types"
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hint = """
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Take a look at the 'Understanding Ownership -> Slices -> Other Slices' section
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of the book: https://doc.rust-lang.org/book/ch04-03-slices.html and use the
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starting and ending (plus one) indices of the items in the `Array` that you
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want to end up in the slice.
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starting and ending (plus one) indices of the items in the array that you want
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to end up in the slice.
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If you're curious why the first argument of `assert_eq!` does not have an
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ampersand for a reference since the second argument is a reference, take a look
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@ -1 +1,23 @@
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// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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#[test]
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fn slice_out_of_array() {
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let a = [1, 2, 3, 4, 5];
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// 0 1 2 3 4 <- indices
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// -------
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// |
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// +--- slice
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// Note that the upper index 4 is excluded.
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let nice_slice = &a[1..4];
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assert_eq!([2, 3, 4], nice_slice);
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// The upper index can be included by using the syntax `..=` (with `=` sign)
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let nice_slice = &a[1..=3];
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assert_eq!([2, 3, 4], nice_slice);
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}
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}
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