have you play this game? this. its pretty funny.

Collections are like arrays or tuples whose size do not need to be known at compile time. The two types are

1. Vectors
2. HashMap (like Dictionaries in c#)

Vectors are resizable arrays whos length do not need to be known at compile time but the size of its type needs to be known.

You can init a vector with the vec! macro. eg

 let x = vec![20,50,20]; 

You can access a certain element like dish rish this*

 println!("{}",x[0]);  

You can iterate through every value like dish rish this* ¹⁾ stolen from the rust by example book

// `Vector`s can be easily iterated over
println!("Contents of xs:");
for x in xs.iter() {
 println!("> {}", x);
}
 
// A `Vector` can also be iterated over while the iteration
// count is enumerated in a separate variable (`i`)
for (i, x) in xs.iter().enumerate() {
 println!("In position {} we have value {}", i, x);
}
 
// Thanks to `iter_mut`, mutable `Vector`s can also be iterated
// over in a way that allows modifying each value
for x in xs.iter_mut() {
 *x *= 3;
}
println!("Updated vector: {:?}", xs);