`[]` 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:

```ruby
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?

```ruby
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***!
```ruby
string["cool"] = "great" # => "great"
string # => "Ruby is a great language"
```
Next time you're munging with strings, remember that `[]` is smarter than you think!

douglasgreyling
January 5, 2022