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Introduction to Go

bookDeleting Keys From Maps

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We can also remove key-value pairs from maps using the delete() function.

delete(mapName, keyName)

Here are some points to note regarding the delete() function:

  • The delete function does not return any value;
  • If the key keyName doesn't exist, it simply does nothing;
  • If the map mapName doesn't exist, it shows an error during compilation.

Here is an example of the delete() function being used in a program:

index.go

index.go

copy

              
12345678910111213

            
package main
import "fmt"

func main() {  
    var numbers = map[string]int {
        "one": 1,
        "two": 2,
        "three": 3,
    }
    fmt.Println(numbers) // Output: map[one:1 three:3 two:2]
    delete(numbers, "three")
    fmt.Println(numbers) // Output: map[one:1 two:2]
}
question mark

Considering the map code below, which of the expressions will execute without compilation errors:

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すべて明確でしたか？

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セクション 6. 章 7

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セクション 6. 章 7
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