How to check if a string starts with another given string in Go
Gutha Vamsi KrishnaIn this shot, we will learn how to check if a string starts with a specified string in Golang.
We can use the HasPrefix function, provided by the strings package, to check if a string starts with some other string.
Syntax
strings.HasPrefix("string","prefix string")
Parameters
This function accepts two parameters:
- The original string that we want to check to see if it starts with the prefix string.
- The string that we check to see if it acts as the prefix to the string in the first parameter.
Return value
This function returns True if the string starts with the provided prefix string. Otherwise, it returns False.
If the string from the first parameter starts with the prefix string in the second parameter, then the function returns True. If the string from the first parameter does not start with the prefix string in the second parameter, then HasPrefix returns False.
Example
In the following example, we will check to see if the string Hello from educative starts with Hello or from.
Code
Let’s look at the code given below.
package main
//import packages
import(
"fmt"
"strings"
)
//program execution starts here
func main(){
//declare string
str := "Hello from educative"
//provide first prefix string
prefstr1 := "Hello"
//check if str starts with prefstr1
fmt.Println("str starts with ",prefstr1," :",strings.HasPrefix(str, prefstr1))
//provide second prefix string
prefstr2 := "from"
//check if str starts with prefstr2
fmt.Println("str starts with ",prefstr2," :",strings.HasPrefix(str, prefstr2))
}Code explanation
In the code snippet above:
-
In line 5, we import the format package
fmt, which is used to format the input and output. -
In line 6, we import the strings package
strings, which has theHasPrefixfunction. -
In line 10, the program execution starts from the
main()function in Golang. -
In line 12, we declare and initialize the string
str. -
In line 15, we declare a substring
prefstr1. -
In line 18, we check to see if the string
strstarts with the substringprefstr1, and then we print the returned result. -
In line 21, we declare a substring
prefstr2. -
In line 24, we check to see if the string
strstarts with the substringprefstr2, and then we print the returned result.
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