How to Use chop in Ruby: Remove Last Character Easily

In Ruby, chop is a method used on strings to remove the last character. It returns a new string without the last character, or removes the trailing newline if present.

Syntax

The chop method is called on a string object without any arguments. It returns a new string with the last character removed.

• string.chop: Returns a new string with the last character removed.
• The original string remains unchanged unless you use chop! which modifies it in place.

ruby

string = "Hello\n"
new_string = string.chop
puts new_string
puts string

Output

Hello
Hello

Example

This example shows how chop removes the last character from a string. It also demonstrates that the original string is not changed unless chop! is used.

ruby

text = "Hello!"
chopped = text.chop
puts "Original: #{text}"
puts "Chopped: #{chopped}"

text.chop!
puts "Modified original: #{text}"

Output

Original: Hello!
Chopped: Hello
Modified original: Hello

Common Pitfalls

One common mistake is expecting chop to remove only newline characters. It actually removes the last character whatever it is. For removing newlines specifically, use chomp.

Also, chop returns a new string and does not change the original string unless you use chop!.

ruby

text = "Hello\n"
puts text.chop   # Removes the newline
puts text.chomp  # Removes the newline but only if it exists

text = "Hello!"
text.chop
puts text       # Original string unchanged
text.chop!
puts text       # Original string changed

Output

Hello
Hello
Hello!
Hello

Quick Reference

Method	Description
chop	Returns a new string with the last character removed
chop!	Removes the last character from the string in place
chomp	Removes trailing newline characters if present
chomp!	Removes trailing newline characters in place

Key Takeaways

Use chop to remove the last character from a string without changing the original.

Use chop! to remove the last character and modify the string itself.

chop removes the last character regardless of what it is; use chomp to remove newlines specifically.

Remember chop returns a new string; the original string stays the same unless chop! is used.