Illustrated Ruby: Variables

In Ruby, variables are implicitly declared when assigned and do not carry type information.
	`a = "initial" p a`
Variables can be reassigned a different type.	`a = true p a`
You can assign multiple variables at once through destructuring assignment of an array.	`b, c = ["destructured", "assignment"] p b, c`
Out-of-bounds variables are `nil`-valued.	d, e, f = ["first", "second, but third will be `nil`"] p d, e, f
Destructured values missing variables are silently dropped.	`g, h = ["one", "two", "dropped"] p g, h`
Variables are always references. Mutating the referenced value thus impacts all other references.	`i = ["foo", "bar"] p i j = i j << "appended" p i`
Variables referenced before assignment are undefined and raise a `NameError`	begin p k rescue NameError puts "`k` was not yet assigned!" end k = true
Variables referenced after a conditional assignment are `nil`-valued.	`l = true if l == 2 p l`

$ ruby examples/variables/variables.rb
"initial"
true
"destructured"
"assignment"
"first"
"second, but third will be `nil`"
nil
"one"
"two"
["foo", "bar"]
["foo", "bar", "appended"]
`k` was not yet assigned!
nil

Next example: Methods