Chapter 2: Solutions

Chapter 2 - Conditionals and Loops

Exercise 1: Calling Methods

The strings package has a Builder type that is used to build a long text string out of multiple shorter ones.

Complete the code sample below. The sample contains comments in several places indicating what the code you add should do.

Solution

package main

import (
	"fmt"
	"strings"
)

func main() {
	// The "builder" variable holds a "strings.Builder"
	// value. We're not assigning a value to "builder",
	// but that's okay; you can call methods on the
	// zero value for the "strings.Builder" type.
	var builder strings.Builder
	
	// YOUR CODE HERE: Call the "WriteRune" method on
	// "builder" 3 times, with the runes 'a', 'b', and 'c'.
	builder.WriteRune('a')
	builder.WriteRune('b')
	builder.WriteRune('c')
	
	// YOUR CODE HERE: Call the "WriteString" method on
	// "builder" once, with the string "defg".
	builder.WriteString("defg")
	
	// YOUR CODE HERE: Call the "String" method on
	// "builder", and pass the result to "fmt.Println".
	fmt.Println(builder.String())
}

Output:

abcdefg