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note's Issues

Go Tips

new
用于为值分配内存,返回的是一个指向类型的指针值。返回的是指针
make
只能用于引用类型的值的创建上,并且结果是第一个参数所代表的类型的值,而不是指向这个值的指针值。所以返回并不是指针。

取址操作符 &

普通赋值语句,左边多值返回的情况

  1. v, ok := map["k2"]
  2. v, ok := x.(string)
  3. v, ok := <- channel

常量与变量

常量

  1. 常量在编译期间创建
  2. 布尔常量,rune 常量。。。
  3. const PI = 3.333333
  4. iota 代表了连续的,无类型的整数常量。
const {
    Sunday = iota
    Monday
    Tuesday
}

const {
    Sunday = 1 <<  iota
    Monday
    Tuesday
}

内建函数

  1. close
  2. len, cap
  3. new, make
  4. append, copy
  5. delete

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