About Strings Package
The strings package provides functions for working with strings.
Below are some of the functions in the package; check out the documentation to see the rest!
| Role |
Function |
Purpose |
| Case Conversion |
ToLower |
Convert a string to lower case |
| Case Conversion |
ToUpper |
Convert a string to upper case |
| Searching |
Contains |
Check if a string contains a specific substring |
| Searching |
Count |
Count non-overlapping occurrences of a substring |
| Searching |
HasPrefix |
Check if a string starts with a specific substring |
| Searching |
HasSuffix |
Check if a string ends with a specific substring |
| Searching |
Index |
Return the index of the first occurrence of a substring, or -1 |
| Modifying |
Replace |
Replace up to n occurrences of a substring |
| Modifying |
ReplaceAll |
Replace all occurrences of a substring |
| Modifying |
TrimSpace |
Remove leading and trailing whitespace |
| Splitting or Joining |
Fields |
Split a string into words by whitespace |
| Splitting or Joining |
FieldsSeq |
Get each word one at a time |
| Splitting or Joining |
Join |
Join a slice of strings with a separator |
| Splitting or Joining |
Split |
Split a string into parts on a separator |
| Splitting or Joining |
SplitSeq |
Get each part one at a time |
import (
"fmt"
"strings"
)
// Case conversion
strings.ToLower("Gopher") // "gopher"
strings.ToUpper("Gopher") // "GOPHER"
// Searching
strings.Contains("Apple", "le") // true
strings.Index("Apple", "le") // 3
strings.Index("Apple", "xyz") // -1
strings.Count("test", "t") // 2
strings.HasPrefix("Gopher", "Go") // true
strings.HasSuffix("Gopher", "er") // true
// Modifying
strings.TrimSpace(" hello ") // "hello"
strings.Replace("aabbcc", "b", "x", 1) // "aaxbcc"
strings.ReplaceAll("aabbcc", "b", "x") // "aaxxcc"
// Splitting or Joining
strings.Fields(" a b\tc ") // []string{"a", "b", "c"}
strings.Split("a,b,c", ",") // []string{"a", "b", "c"}
strings.Join([]string{"a", "b", "c"}, ",") // "a,b,c"
// You do not need to worry about this range syntax yet.
// It is covered later in the range iteration concept.
for word := range strings.FieldsSeq(" a b\tc ") {
fmt.Println(word)
}
// Output:
// a
// b
// c
for part := range strings.SplitSeq("a,b,c", ",") {
fmt.Println(part)
}
// Output:
// a
// b
// c
1 exercise
Learn Strings Package