Source: and vs && (double ampersand) in Ruby - Momoro Machine [themomorohoax.com] via Twitter / Fabio Akita: RT @igrigorik: just learne ... [twitter.com]

Many people seem to prefer using and instead of && in Ruby, as it sounds more like speech.

However, do note that it’s slightly different from using &&. The difference is important enough that I think you should avoid using and.


alien = true
speaks_english = false

# 1
alien and speaks_english ? 'hello' : '**silence**'
#=> "**silence**"

# 2
alien && speaks_english ? 'hello' : '**silence**'
#=> "**silence**"

# 3
speaks_english and alien ? 'hello' : '**silence**'
#=> false # oops

# 4
speaks_english && alien ? 'hello' : '**silence**'
#=> "**silence**"



Interestingly enough ...

alien = true
speaks_english = false

# 1
if alien and speaks_english then 'hello' else '**silence**' end
#=> "**silence**"

# 2
if alien && speaks_english then 'hello' else '**silence**' end
#=> "**silence**"

# 3
if speaks_english and alien then 'hello' else '**silence**' end
#=> "**silence**"

# 4
if speaks_english && alien then 'hello' else '**silence**' end
#=> "**silence**"


Read more: http://feeds.dzone.com/~r/dzone/snippets/~3/Vx1IVnrCBNM/11733