write part 03

[rust-101.git] / src / part01.rs

diff --git a/src/part01.rs b/src/part01.rs
index 7603c1fa79593467d63c354c293d3bef21b07437..d046a1b70330f7769276a94abe9e488591a7be80 100644 (file)
--- a/src/part01.rs
+++ b/src/part01.rs
@@ -34,16 +34,10 @@ fn number_or_default(n: NumberOrNothing, default: i32) -> i32 {
     }
 }
 
     }
 }
 

-// With this fresh knowledge, let us now refactor `vec_min`. First of all, we are doing a small change
-// to the type: `&Vec<i32>` denotes a *reference* to a `Vec<i32>`. You can think of this as a pointer
-// (in C terms): Arguments in Rust are passed *by value*, so we need to employ explicit references if
-// that's not what we want. References are per default immutable (like variables), a mutable reference
-// would be denoted `&mut Vec<i32>`.
-fn vec_min(v: &Vec<i32>) -> NumberOrNothing {
+// With this fresh knowledge, let us now refactor `vec_min`.
+fn vec_min(v: Vec<i32>) -> NumberOrNothing {

     let mut min = Nothing;
     for e in v {
     let mut min = Nothing;
     for e in v {

-        // Now that `v` is just a reference, the same goes for `e`, so we have to dereference the pointer.
-        let e = *e;

         // Notice that all we do here is compute a new value for `min`, and that it will always end
         // up being a `Number` rather than `Nothing`. In Rust, the structure of the code
         // can express this uniformity.
         // Notice that all we do here is compute a new value for `min`, and that it will always end
         // up being a `Number` rather than `Nothing`. In Rust, the structure of the code
         // can express this uniformity.


@@ -87,13 +81,14 @@ fn read_vec() -> Vec<i32> {
 }
 pub fn part_main() {
     let vec = read_vec();
 }
 pub fn part_main() {
     let vec = read_vec();

-    let min = vec_min(&vec);
+    let min = vec_min(vec);

     min.print();
 }
 // You will have to replace `part00` by `part01` in the `main` function in
 // `main.rs` to run this code.
 
 // **Exercise**: Write a funtion `vec_avg` that computes the average value of a `Vec<i32>`.
     min.print();
 }
 // You will have to replace `part00` by `part01` in the `main` function in
 // `main.rs` to run this code.
 
 // **Exercise**: Write a funtion `vec_avg` that computes the average value of a `Vec<i32>`.

+// 

 // *Hint*: `vec.len()` returns the length of a vector `vec`.
 
 // [index](main.html) | [previous](part00.html) | [next](part02.html)
 // *Hint*: `vec.len()` returns the length of a vector `vec`.
 
 // [index](main.html) | [previous](part00.html) | [next](part02.html)