Recover usage in Go - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to recover from a panic and print a message.

Go

func safeDivide(a, b int) {
    defer func() {
        if r := [1](); r != nil {
            println("Recovered from panic:", r)
        }
    }()
    println(a / b)
}

Drag options to blanks, or click blank then click option'

Arecover

Bpanic

Cdefer

Dclose

Attempts:

3 left

💡 Hint

Common Mistakes

Using panic() instead of recover() inside the deferred function.

Calling recover() outside a deferred function.

The recover() function is used inside a deferred function to catch a panic and prevent the program from crashing.

2fill in blank

medium

Complete the code to safely handle a panic and print a custom message.

Go

func handlePanic() {
    defer func() {
        if err := [1](); err != nil {
            println("Error caught:", err)
        }
    }()
    panic("something went wrong")
}

Drag options to blanks, or click blank then click option'

Arecover

Bpanic

Cclose

Dexit

Attempts:

3 left

💡 Hint

Common Mistakes

Using panic() instead of recover() to catch errors.

Not using defer with recover().

recover() captures the panic value inside the deferred function, allowing graceful error handling.

3fill in blank

hard

Fix the error in the code to properly recover from a panic.

Go

func faulty() {
    defer func() {
        if r := [1](); r != nil {
            println("Recovered:", r)
        }
    }()
    panic("fail")
}

Drag options to blanks, or click blank then click option'

Apanic()

Brecover

Crecover()

Ddefer

Attempts:

3 left

💡 Hint

Common Mistakes

Using recover without parentheses.

Calling panic instead of recover.

The recover() function must be called with parentheses to execute it and get the panic value.

4fill in blank

hard

Fill both blanks to create a function that recovers from panic and prints the panic message.

Go

func safeRun() {
    defer func() {
        if err := [1](); err != nil {
            println("Caught panic:", [2])
        }
    }()
    panic("unexpected error")
}

Drag options to blanks, or click blank then click option'

Arecover

Berr

Cpanic

Drecover()

Attempts:

3 left

💡 Hint

Common Mistakes

Using panic instead of recover.

Printing recover() instead of the variable.

Use recover() to get the panic value and print the variable holding it.

5fill in blank

hard

Fill all three blanks to recover from panic and print a detailed message.

Go

func execute() {
    defer func() {
        if panicVal := [1](); panicVal != nil {
            println("Recovered panic:", [2], "with value", [3])
        }
    }()
    panic("critical failure")
}

Drag options to blanks, or click blank then click option'

Arecover

BpanicVal

Dpanic

Attempts:

3 left

💡 Hint

Common Mistakes

Using panic instead of recover.

Using different variable names inconsistently.

Call recover() to get the panic value, then print the variable holding it twice for clarity.