Go Map containsKey()

1 개요

Go Map containsKey()

Go

CPU

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MEM

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package main

import "fmt"

func main() {
	dict := map[string]int{
		"apple":  40,
		"banana": 70,
	}

	var ok bool

	_, ok = dict["apple"]
	fmt.Println(ok) // true

	_, ok = dict["lemon"]
	fmt.Println(ok) // false
}

true
false

Go

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package main

import "fmt"

func main() {
	dict := map[string]int{
		"apple":  40,
		"banana": 70,
	}

	if _, ok := dict["apple"]; ok {
		fmt.Println("apple exists.") // apple exists.
	} else {
		fmt.Println("apple not exists.")
	}
	
	if _, ok := dict["lemon"]; ok {
		fmt.Println("lemon exists.")
	} else {
		fmt.Println("lemon not exists.") // lemon not exists.
	}
}

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Go

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package main

import "fmt"

func main() {
	dict := map[string]int{
		"apple":  40,
		"banana": 70,
	}

	if val, ok := dict["apple"]; ok {
		fmt.Println("apple:", val) // apple: 40
	} else {
		fmt.Println("apple not exists.")
	}
	
	if val, ok := dict["lemon"]; ok {
		fmt.Println("lemon:", val)
	} else {
		fmt.Println("lemon not exists.") // lemon not exists.
	}
}

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• 함수 containsKey()