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Introduction to Go

Challenge: Reviewing Concepts of Functions

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Task

  1. Finish the code for the second parameter of the operate function, which is expected to accept the capitalize function;
  2. Review the code and provide suitable arguments in the operate function call within the main() function;
  3. Save the returned values from the operate function call into the variables original and updated.
index.go

index.go


              
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package main
import "fmt"

// `ToLower()` and `ToUpper()` functions are imported from the `strings` module
import "strings"

func capitalize(str string) string {
    return strings.ToUpper(str)
}

func operate(str string, operation ___) (string, string) {
    return str, operation(str)
}

func main() {
    inputString := "Hello World"
 
    var original string
    var updated string

    ___ = operate(___)
    fmt.Println(original, updated)
}
Hint
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Pass inputString and capitalize to the operate function.

Solution
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package main
import "fmt"

// ToLower() and ToUpper() functions are imported from the `strings` module
import "strings"

func capitalize(str string) string {
    return strings.ToUpper(str)
}

func operate(str string, operation func(string) string) (string, string) {
    return str, operation(str)
}

func main() {
    inputString := "Hello World"
   
    var original string
    var updated string

    original, updated = operate(inputString, capitalize)
    fmt.Println(original, updated)
}
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Section 4. Chapter 7

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Section 4. Chapter 7
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