关于golang:golang-笔记

1.foreach

for循环是对值的拷贝

type student struct {    Name string    Age int}func forDemo() {    m := make(map[string] * student)    stus := [] student {        {            Name: "zhang",            Age: 24,        }, {            Name: "li",            Age: 23,        }, {            Name: "zhao",            Age: 22,        },    }    for i := 0; i < len(stus); i++ {        stus[i].Age = stus[i].Age + 10 //这样操作    }    for i := 0;i<len(stus);i++ {        m[stus[i].Name] = & stus[i]  //这样操作    }    for k, v := range m {        println(k, "=>", v.Name,v.Age)    }}

2.chan作为互斥锁

func add(h chan int, wg *sync.WaitGroup) {    defer wg.Done()    h <- 1        num += 1    <-h}