如何使用值初始化映射-编程学习网

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问题内容

我在 go 中创建了多行地图并设置了值。

type animal struct {
  food, locomotion, sound string
}

type animalinterface interface {
  eat()
  move()
  speak()
}

animals := make(map[string]animal)
animals["cow"] = animal{"grass", "walk", "moo"}
animals["bird"] = animal{"worms", "fly", "peep"}
animals["snake"] = animal{"mice", "slither", "hsss"}

我更喜欢一步完成创建和初始化。这不起作用...我应该如何解决它？

animals := map[string]animal{
  "cow": animal{"grass", "walk", "moo"}
  "bird": animal{"worms", "fly", "peep"}
  "snake": animal{"mice", "slither", "hsss"}
}

编辑添加逗号

  animals := map[string]animal{
    "cow": animal{"grass", "walk", "moo"},
    "bird": animal{"worms", "fly", "peep"},
    "snake": animal{"mice", "slither", "hsss"}
  }

❯ go run animals.go
# command-line-arguments
./animals.go:109:47: syntax error: unexpected newline, expecting comma or }

解决方案

错字。您在地图元素后面漏掉了逗号。

package main

import (
    "fmt"
)

type Animal struct {
    food, locomotion, sound string
}

type AnimalInterface interface {
    Eat()
    Move()
    Speak()
}

func main() {
    animals := map[string]Animal{
        "cow": Animal{"grass", "walk", "moo"},
        "bird": Animal{"worms", "fly", "peep"},
        "snake": Animal{"mice", "slither", "hsss"},
    }

    fmt.Println(animals)
}

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