What is the use of join method in go language?

In the Go language, join() is a string processing function of the strings package. It can convert an array (slice) into a string, that is, connect all the elements present in the string slice (array) into a single String; syntax "strings.Join(s,sep)", parameter "s" is the string slice (array) used to connect elements, parameter "sep" is the separator placed between elements in the final string.

The operating environment of this tutorial: Windows 7 system, GO version 1.18, Dell G3 computer.

Join method in golang

The strings.Join() function in Golang slices all elements present in the string (array) Concatenate into a single string. This function is available in the string package.

func Join(s []string, sep string) string

• Here, s is a string slice (array) that can be used to concatenate elements, and sep is the separator placed between elements in the final string.

Return value: It returns a string.

Explanation:

The Join() function in go is similar to the Array.prototype.join method in js. They both splice one element into each element of the array. Target string, the target string is the parameter of the join method

Different from js, js is a weakly typed language, so you can directly use the join method for an array of numbers. During the execution process, js will Implicitly convert an array of number type into an array of string type and then perform string concatenation. Golang is a strongly typed static language. This is not allowed in golang. Type conversion must be performed explicitly or passed in directly. An array of strings, otherwise an exception will be thrown at compile time.

strings.Join([]int{1,2,3},"+") //error

In addition, the strings.Join method is more efficient than ordinary string splicing in the form of "str" ​​"str2". This is because the string itself is a constant, and it is spliced ​​into a new String, you must destroy the original string object, and then make the current reference point to the new string object. This is very expensive, but strings.Join does not.

Usage Example

Example 1:

// Golang program to illustrate the 
// use of strings.Join Function 
  
package main 
  
// importing fmt and strings 
import ( 
    "fmt"
    "strings"
) 
  
// calling main method 
func main() { 
  
    // array of strings. 
    str:= []string{"Geeks", "For", "Geeks"} 
  
    // joining the string by separator 
    fmt.Println(strings.Join(str, "-")) 
}

Output:

Geeks-For-Geeks

Example 2:

// Golang program to illustrate the 
// use of strings.Join Function 
  
package main 
  
// importing fmt and strings 
import ( 
    "fmt"
    "strings"
) 
  
// calling main method 
func main() { 
    // array of strings. 
    str:= []string{"A", "Computer-science", "portal", "for", "Geeks"} 
    // joining the string by separator in middle. 
    fmt.Println(strings.Join(str, " ")) 
}

Output:

A Computer-science portal for Geeks

[Related recommendations: Go video Tutorial、Programming Teaching】

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