Are strings in Ruby mutable?

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/8580304/are-strings-in-ruby-mutable

Answer 1

Yes, strings in Ruby, unlike in Python, are mutable.

s += "hello" is not appending "hello" to s - an entirely new string object gets created. To append to a string 'in place', use <<, like in:

s = "hello"
s << "   world"
s # hello world