Rust : 高富帅的match

match绝对是Rust的亮点，其官网的首页也证明了这点。match终于告别switch时代，让人耳目一新。

不仅颜值高，而且是深不可测，用牛BHH来讲，是不过分。接下来，希望好好整一下。

1、替代老旧的if else.

match不仅能用在固定值的场合，带“范围”的也是没问题的。

不过，在这儿，用上了guard.

let temp =2.0_f32;match temp {x if x > 0_f32 => println!(">0"), //if x> 0=>guard模式_ => println!("<=0"),}

2、最佳的场合，enum

齐整呀！

enum Color {// These 3 are specified solely by their name.Red,Blue,Green,}

let color = Color::Red;println!("What color is it?");match color {Color::Red => println!("The color is Red!"),Color::Blue => println!("The color is Blue!"),Color::Green => println!("The color is Green!"),}

3、绑定

绝对完美！

let var =5_u32;match age() {0 => println!("I'm not born yet I guess"),n @ 1 ... 12 => println!("I'm a child of age {:?}", n),n @ 13 ... 19 => println!("I'm a teen of age {:?}", n),n => println!("I'm an old person of age {:?}", n),}