corrections

subjects/unwrap_or_expect/README.md

@@ -1,48 +1,81 @@
-## unwrap
+## unwrap_or_expect
 
 ### Instructions
 
-It will be given a function called **odd_to_even**, that returns an `Result`. If its an error it will
-return a tuple with a string, indicating the error, and a vector with the elements that justifies the error
+A **function** called **odd_to_even** will be given, which returns a `Result`. If an error occurs the function will
+return a tuple with a string, stating the error, and a vector with the elements which causing the error.
 
-The objective is to execute the `odd_to_even` function and handle the error given by it
+The objective is to execute the `odd_to_even` function and handle the error returned by it.
 
-Create the following functions that receives a vector :
+Create the following functions which receives a vector :
 
-- `expect` that returns the error adding the sting "ERROR "
-- `unwrap_or` that in case of error returns an empty vector
-- `unwrap_err` that returns error if its `Ok` and returns the
-   string containing the error in case of `Err`
-- `unwrap` that unwraps the `Result`
-- `unwrap_or_else` that in case of error returns a the vector that justifies the error
+- `expect` which returns the error adding the string "ERROR "
+- `unwrap_or` which in case of error returns an empty vector
+- `unwrap_err` which returns error if its `Ok` and returns the
+  string containing the error in case of `Err`
+- `unwrap` which unwraps the `Result`
+- `unwrap_or_else` which in case of error returns the vector of elements which causes the error
 
-### Expected Function
+### Notions
+
+- [Error Handling](https://doc.rust-lang.org/book/ch09-00-error-handling.html)
+- [Unwrap keywords](https://doc.rust-lang.org/std/?search=unwrap)
+
+### Expected Functions
 
 ```rust
-pub fn odd_to_even(data: Vec<u32>) -> Result<Vec<u32>, (String, Vec<u32>)> {}
-pub fn expect(v: Vec<u32>) -> Vec<u32> {}
-pub fn unwrap_or(v: Vec<u32>) -> Vec<u32> {}
-pub fn unwrap_err(v: Vec<u32>) -> (String, Vec<u32>) {}
-pub fn unwrap(v: Vec<u32>) -> Vec<u32> {}
-pub fn unwrap_or_else(v: Vec<u32>) -> Vec<u32> {}
+pub fn odd_to_even(data: Vec<u32>) -> Result<Vec<u32>, (String, Vec<u32>)> {
+    let mut a = Vec::new();
+    a.extend(data.iter().filter(|&value| value % 2 == 0));
+    if a.len() != 0 {
+        return Err(("There is a even value in the vector!".to_string(), a));
+    }
+    a.extend(data.iter().map(|&value| {
+        value + 1
+    }));
+    Ok(a)
+}
+pub fn expect(v: Vec<u32>) -> Vec<u32> {
+
+}
+pub fn unwrap_or(v: Vec<u32>) -> Vec<u32> {
+
+}
+pub fn unwrap_err(v: Vec<u32>) -> (String, Vec<u32>) {
+
+}
+pub fn unwrap(v: Vec<u32>) -> Vec<u32> {
+
+}
+pub fn unwrap_or_else(v: Vec<u32>) -> Vec<u32> {
+
+}
 ```
 
 ### Usage
 
-Here is a program to test your function
+Here is a program to test your function:
 
 ```rust
+use unwrap_or_expect::*;
+
 fn main() {
-    // this will give an expect error
+    // // if uncommented, the below line will give an expect "ERROR "
     // println!("{:?}", expect(vec![1, 3, 2, 5]));
+
     println!("{:?}", unwrap_or(vec![1, 3, 2, 5]));
     println!("{:?}", unwrap_or(vec![1, 3, 5]));
+
     println!("{:?}", unwrap_err(vec![1, 3, 2, 5]));
-    // this will give an error that is unwraped
+
+    // // if uncommented, the below line will give an unwraped error
     // println!("{:?}", unwrap_err(vec![1, 3, 5]));
+
     println!("{:?}", unwrap(vec![1, 3, 5]));
-    // this will give an error
+
+    //// if uncommented, the below line will give an error
     // println!("{:?}", unwrap(vec![1, 3, 2, 5]));
+
     println!("{:?}", unwrap_or_else(vec![1, 3, 5]));
     println!("{:?}", unwrap_or_else(vec![3, 2, 6, 5]));
 }
@@ -51,16 +84,13 @@ fn main() {
 And its output:
 
 ```console
-student@ubuntu:~/[[ROOT]]/test$ cargo run
 []
 [2, 4, 6]
 ("There is a even value in the vector!", [2])
 [2, 4, 6]
+Ok([2, 4, 6])
 [2, 4, 6]
+Err(("There is a even value in the vector!", [2, 6]))
 [2, 6]
 student@ubuntu:~/[[ROOT]]/test$
 ```
-
-### Notions
-
-- https://doc.rust-lang.org/std/?search=unwrap