strings.FieldsFunc() Function in Golang With Examples
Last Updated :
19 Apr, 2020
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strings.FieldsFunc() Function in Golang is used to splits the given string str at each run of Unicode code points c satisfying f(c) and returns an array of slices of str.
Syntax:
func FieldsFunc(str string, f func(rune) bool) []stringHere, str is the given string, the rune is a built-in type meant to contain a single Unicode character and f is a user-defined function.
Return: If all code points in str satisfy f(c) or the string is empty, an empty slice is returned.
Note: This function makes no guarantees about the order in which it calls f(c). If f does not return consistent results for a given c, FieldsFunc may crash.
Example 1:
// Golang program to illustrate the // strings.FieldsFunc() Function package main import ( "fmt" "strings" "unicode") func main() { // f is a function which returns true if the // c is number and false otherwise f := func(c rune) bool { return unicode.IsNumber(c) } // FieldsFunc() function splits the string passed // on the return values of the function f // String will therefore be split when a number // is encontered and returns all non-numbers fmt.Printf("Fields are: %q\n", strings.FieldsFunc("ABC123PQR456XYZ789", f)) } |
Output:
Fields are: ["ABC" "PQR" "XYZ"]
Example 2:
// Golang program to illustrate the // strings.FieldsFunc() Function package main import ( "fmt" "strings" "unicode") func main() { // f is a function which returns true if the // c is a white space or a full stop // and returns false otherwise f := func(c rune) bool { return unicode.IsSpace(c) || c == '.' } // We can also pass a string indirectly // The string will split when a space or a // full stop is encontered and returns all non-numbers s := "We are humans. We are social animals." fmt.Printf("Fields are: %q\n", strings.FieldsFunc(s, f)) } |
Output:
Fields are: ["We" "are" "humans" "We" "are" "social" "animals"]
