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Golang strings.Map func
Use strings.Map to change characters in a string. Specify a func for strings.Map.Strings.Map. Sometimes we need to modify each character (or only some characters) in a string. A for-loop could be used. But a Map() function is better.Strings
With strings.Map, we apply a character transformation to each character in a string. In the func, we can use any logic—we can do lookups, or use conditional statements.
An example. Here we use strings.Map to replace all uppercase letter "A" runes with underscores. This example shows how to apply logic to transform each rune.
And: Further branches in the conditional can be used. Loops, lookup tables (with a map or slice) can be searched.
Golang program that uses strings.Map
package main
import (
"fmt"
"strings"
)
func main() {
transform := func(r rune) rune {
// Map uppercase A to underscore.
if r == 'A' {
return '_'
}
return r
}
input := "STARRY NIGHT, A PAINTING"
fmt.Println(input)
// Use Map() to run func on each rune.
result := strings.Map(transform, input)
fmt.Println(result)
}
Output
STARRY NIGHT, A PAINTING
ST_RRY NIGHT, _ P_INTING
Notes, ROT13. For things like ROT13, the strings.Map function should be used. If you need to mask certain characters (like digits or spaces) strings.Map is also effective.
A summary. Simple is best. For Golang, using strings.Map eliminates a loop. And with fewer loops, it is possible for us to have fewer bugs. This func is a useful tool in Go.
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