In 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.
strings.HasPrefix("string","prefix string")
This function accepts two parameters:
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.
In the following example, we will check to see if the string Hello from educative starts with Hello or from.
Let’s look at the code given below.
package main//import packagesimport("fmt""strings")//program execution starts herefunc main(){//declare stringstr := "Hello from educative"//provide first prefix stringprefstr1 := "Hello"//check if str starts with prefstr1fmt.Println("str starts with ",prefstr1," :",strings.HasPrefix(str, prefstr1))//provide second prefix stringprefstr2 := "from"//check if str starts with prefstr2fmt.Println("str starts with ",prefstr2," :",strings.HasPrefix(str, prefstr2))}
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 the HasPrefix function.
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 str starts with the substring prefstr1, 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 str starts with the substring prefstr2, and then we print the returned result.