Some Concepts

1.type system

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1.1 Scalar Types

Type	Instant
Int	i32 u32
Float	float32 float64
Boolean	true false
Char	'z'

1.2 Compound Types

stuct
enum
array tuple

2.variables

pattern

let && if let && while let

3.loop

----if
----loop
----while
----for

4.ownership

4.1 ownership

Each value in Rust has an owner.
There can only be one owner at a time.
When the owner goes out of scope, the value will be dropped.

impl copy trait
>All the integer types, such as u32.
>The Boolean type, bool, with values true and false.
>All the floating-point types, such as f64.
>The character type, char.
>Tuples, if they only contain types that also implement Copy. For example, (i32, i32) implements Copy, but (i32, String) does not.

4.2 borrow and reference

Reference Rules
>At any given time, you can have either one mutable reference or any number of immutable references.
>References must always be valid.

5.generic

.generic in struct and enum

stuct <T> People {
    name: T,
    id: T,
} 

.generic in fn

fn <T> get(s: T) -> T{}  
fn <T, F> put(s: T) -> F
where
F: FnOnce
{}

.

6.trait

  Box<dyn trait>

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7.lifetime

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8.closure

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9.smart pointer

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10.about core && alloc && std crates