index of ruby code example

Example 1: ruby each with index

colors = ['red', 'green', 'blue']
colors.each_with_index do |item, index|
	p "#{index}:#{item}" 
end

"0:red"
"1:green"
"2:blue"

Example 2: ruby find index of element in array

a = [ "a", "b", "c" ]
a.index("b")              #=> 1
a.index("z")              #=> nil