Difference between “or” and || in Ruby? [duplicate]

Answer 1

The way I use these operators:

||, && are for boolean logic. or, and are for control flow. E.g.

do_smth if may_be || may_be -- we evaluate the condition here

do_smth or do_smth_else -- we define the workflow, which is equivalent to do_smth_else unless do_smth

to give a simple example:

> puts "a" && "b"
b

> puts 'a' and 'b'
a

A well-known idiom in Rails is render and return. It's a shortcut for saying return if render, while render && return won't work. See "Avoiding Double Render Errors" in the Rails documentation for more information.

Answer 2

or is NOT the same as ||. Use only || operator instead of the or operator.

Here are some reasons. The:

• or operator has a lower precedence than ||.
• or has a lower precedence than the = assignment operator.
• and and or have the same precedence, while && has a higher precedence than ||.