`[]` is smarter thank you think!

You’re probably very familiar with using [] on objects which are enumerable, but [] has a few more tricks up it’s sleeve when it comes to strings which you may not know about:

string = "Ruby is a cool language"

Did you know that you can use [] to fetch a substring from a string, and return nil if it doesn’t exist?

string["cool lang"] # => "cool lang"
string["foo"] # => nil

You can even throw a Regex in that bad boy and you’re off to the Regex races!

And for the final trick we’ll make a pesky substring DISAPPEAR!

string["cool"] = "great" # => "great"
string # => "Ruby is a great language"

Next time you’re munging with strings, remember that [] is smarter than you think!