String methods (upcase, downcase, strip) in Ruby - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the upcase method do to a string in Ruby?

The upcase method converts all the letters in a string to uppercase letters.

beginner

How does the downcase method affect a string?

The downcase method changes all letters in the string to lowercase letters.

beginner

What is the purpose of the strip method in Ruby strings?

The strip method removes any spaces or whitespace characters from the start and end of the string.

intermediate

Given the string " Hello World ", what will strip.upcase return?

It will return "HELLO WORLD". First, strip removes spaces at the start and end, then upcase changes all letters to uppercase.

beginner

True or False: downcase changes numbers and symbols in a string.

False. downcase only changes uppercase letters to lowercase. Numbers and symbols stay the same.

What does "Ruby".upcase return?

A "ruby"

B "Ruby"

C "RUBY"

D "rUBY"

The upcase method converts all letters to uppercase, so "Ruby" becomes "RUBY".

What will " space ".strip return?

A "space"

B " space "

C "space "

D " space"

strip removes spaces from both ends, so the result is "space".

Which method changes all letters in a string to lowercase?

A capitalize

B strip

C upcase

D downcase

downcase converts all letters to lowercase.

What does " Hello ".strip.upcase return?

A " HELLO "

B "HELLO"

C "hello"

D "Hello"

First strip removes spaces, then upcase makes all letters uppercase, resulting in "HELLO".

Does strip remove spaces inside the string?

A No, only spaces at the start and end are removed

B Yes, all spaces are removed

C Yes, but only tabs

D No, it does nothing

strip only removes spaces and whitespace at the beginning and end, not inside the string.

Explain how you can use upcase, downcase, and strip methods to clean and format a user input string.

Think about removing extra spaces and making all letters the same case.

What happens if you call strip on a string with no spaces at the start or end?

Consider if the string is already clean.