Map()

Published Sep 28, 2023
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The strings.Map() method changes the characters of a provided string according to a given mapping function. It returns a modified copy of the original string.

Syntax

strings.Map(mappingFunc(r), s)

The strings.Map() function takes two parameters:

  • mappingFunc(r): A function and a character (type rune) that the original character will be replaced with.
  • s: The given string in which the characters will be replaced.

Note: If a negative value is returned when a character is mapped, it is dropped from the string without a replacement.

Example

The following example shows the implementation of strings.Map():

package main
import (
"fmt"
"strings"
)
func main() {
mapped := func(r rune) rune {
if r == 'e' {
return '3'
}
return r
}
input := "Halloween"
result := strings.Map(mapped, input)
fmt.Println(result)
}

This example results in the following output:

Hallow33n

Codebyte Example

The following example can be run and uses the strings.Map() function to replace the character "a" with "@".

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