Trust iterator


In trust, the for loop is convenient to write because it is a syntax sugar in most cases
It’s easy to write code like Python

list_ = [1, 2, 3, 4, 5]
for item in list_:

This is true in trust:

let mut vector = vec![1, 2, 3, 4, 5];
for item in vector {
	println!("{}", item);

In the above code, the compiler does some work for us. In fact, we traverse the iterator of vector

//By default, a type that implements iterator trait is traversed directly
//Default alignment uses ` Iter() ` method, which will obtain the immutable borrowing of variables
for item: &i32 in vector.iter() {

You may have seen code like this:

//This is actually a call to vector iter_ Mut() ` method, using its variable borrowing
for item: &mut i32 in &mut vector {

//The above code is equivalent to
for item: &mut i32 in vector.iter_mut() {

In addition to the first time, you can alsointo_iter()To transfer ownership

let vector = vec![1, 2, 3, 4, 5];
let mut iter = v.into_iter();
// println! ("{:?}",  vector);  This will report an error because the ownership of the vector has been
//Taken by ITER

reference resources:
rust std:
Trust Bible:

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