a = 10
b = 20
c = a && b
puts c #=> 20

When I look at code like this, my brain assumes that return value would be a boolean and not 20.

However that is slowly changing.

As I spend more time looking a JavaScript code I am embracing this style of coding. The above code is ruby code and I do not see many cases of assigning a value like this in ruby. May be it is not in the cultural DNA of ruby. In ruby world I have used or operation to assign value to a variable.

a = 10
b = 20
c = a || b
puts c #=> 10

However in JavaScript land it is a different story. Checkout following code from jQuery.

complete: fn || !fn && easing || jQuery.isFunction( speed ) && speed

At first I thought second condition would assign a boolean value to complete. However if second condition is true then value assigned to complete would be easing which is a truthy value.

Embracing a new language is making brain unlearn a few things.