How to Sort a Slice of Strings in Golang? - GeeksforGeeks

26 Aug, 2019
In Go language slice is more powerful, flexible, convenient than an array, and is a lightweight data structure. The slice is a variable-length sequence which stores elements of a similar type, you are not allowed to store different type of elements in the same slice. Go language allows you to sort the elements of the slice according to its type. So, a string type slice is sorted by using the following functions. These functions are defined under the sort package so, you have to import sort package in your program for accessing these functions:
1. Strings: This function is used to only sorts a slice of strings and it sorts the elements of the slice in increasing order.
Syntax:
func Strings(scl []string)
Here, slc represent a slice of strings. Let us discuss this concept with the help of an example:
Example:
// Go program to illustrate how// to sort the slice of stringspackage main  import (    "fmt"    "sort")  // Main functionfunc main() {      // Creating and initializing slices    // Using shorthand declaration    scl1 := []string{"abc", "rwp", "def", "por", "ber", "erj"}    scl2 := []string{"Rabbit", "Fish", "Dog",              "Parrot", "Cat", "Hamster"}      // Displaying slices    fmt.Println("Slices(Before):")    fmt.Println("Slice 1: ", scl1)    fmt.Println("Slice 2: ", scl2)      // Sorting the slice of strings    // Using Strings function    sort.Strings(scl1)    sort.Strings(scl2)      // Displaying the result    fmt.Println("\nSlices(After):")    fmt.Println("Slice 1 : ", scl1)    fmt.Println("Slice 2 : ", scl2)}
Output:
Slices(Before):
Slice 1:  [abc rwp def por ber erj]
Slice 2:  [Rabbit Fish Dog Parrot Cat Hamster]

Slices(After):
Slice 1 :  [abc ber def erj por rwp]
Slice 2 :  [Cat Dog Fish Hamster Parrot Rabbit]

2. StringsAreSorted: This function is used to check whether the given slice of strings is in sorted form(in increasing order) or not. This method returns true if the slice is in sorted form, or return false if the slice is not in the sorted form.
Syntax:
func StringsAreSorted(scl []string) bool
Here, scl represents a slice of strings. Let us discuss this concept with the help of an example:
Example:
// Go program to illustrate how to check// whether the given slice of strings// is in sorted form or notpackage main  import (    "fmt"    "sort")  // Main functionfunc main() {      // Creating and initializing slices    // Using shorthand declaration    scl1 := []string{"abc", "ber", "def", "erj", "por", "rwp"}    scl2 := []string{"Rabbit", "Fish", "Dog",                  "Parrot", "Cat", "Hamster"}      // Displaying slices    fmt.Println("Slices:")    fmt.Println("Slice 1: ", scl1)    fmt.Println("Slice 2: ", scl2)      // Checking the slice is in sorted form or not    // Using StringsAreSorted function    res1 := sort.StringsAreSorted(scl1)    res2 := sort.StringsAreSorted(scl2)      // Displaying the result    fmt.Println("\nResult:")    fmt.Println("Is Slice 1 is sorted?: ", res1)    fmt.Println("Is Slice 2 is sorted?: ", res2)}
Output:
Slices:
Slice 1:  [abc ber def erj por rwp]
Slice 2:  [Rabbit Fish Dog Parrot Cat Hamster]

Result:
Is Slice 1 is sorted?:  true
Is Slice 2 is sorted?:  false

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