Question

How to use # frozen_string_literal: true in Ruby

Answer 1

# frozen_string_literal: true

greeting = "Hello, You!"

# This will raise an error because the string is frozen:

# greeting << " How are you?" # can't modify frozen String: "Hello, You!" (FrozenError)

puts greeting


# Why use it?
# Performance — Ruby doesn’t need to allocate new string objects repeatedly.
# Safety — Prevents accidental mutation of constants or shared strings.
# Modern Ruby — Ruby 3.0+ is moving toward freezing all string literals by default.



# run:
#
# Hello, You!
#

 

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