Rescue modifier (inline form) in Ruby - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to return 0 if the division raises an error.

Ruby

result = 10 / 0 [1] 0

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

Arescue

Bretry

Censure

Dbegin

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'retry' instead of 'rescue' causes syntax errors.

Using 'ensure' does not handle exceptions inline.

The rescue modifier catches exceptions inline and returns the value after it if an error occurs.

2fill in blank

medium

Complete the code to safely convert a string to integer, returning 0 if it fails.

Ruby

number = Integer('abc') [1] 0

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

Abegin

Bensure

Celse

Drescue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'begin' or 'ensure' inline causes syntax errors.

Not handling exceptions leads to program crash.

The rescue modifier catches the exception from Integer('abc') and returns 0.

3fill in blank

hard

Fix the error in the code to return 'error' if the method call fails.

Ruby

value = some_method [1] 'error'

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

Aretry

Brescue

Craise

Densure

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'retry' causes infinite loops.

Using 'raise' re-raises the exception.

The rescue modifier catches exceptions and returns the fallback value.

4fill in blank

hard

Fill both blanks to return the length of a string or 0 if it is nil.

Ruby

length = str[1].length [2] 0

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

A&

Brescue

C&.

D||

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&' instead of safe navigation '&.'.

Using 'rescue' instead of '||' returns nil if str is nil.

The safe navigation operator &. returns nil if str is nil without raising an error. The || operator returns 0 if the result is nil.

5fill in blank

hard

Fill all three blanks to safely parse a number or return -1 if it fails.

Ruby

result = (input[1].to_i) [2] -1 [3] -1

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

A&.

Brescue

C||

D&

Attempts:

3 left

💡 Hint

Common Mistakes

Using '&' instead of '&.'.

Not using rescue causes crashes.

Misusing '||' changes logic.

The safe navigation operator &. calls to_i only if input is not nil. The rescue modifier catches exceptions and returns -1. The || operator returns -1 if the left side is false or nil.