Difference between include and require for modules?

What I understand from require statement is that the argument to it is a
file, where as include requires module/class name.

But once I do a require for a specific ruby file which has various
modules
and classes, doesn’t these classes/modules get included automatically?
infact they do get automatically as I have tried doing so.

But in various files of ruby library I found that people use include
“modulename” after a require statement for the file which contains that
module.

Any reasons?

Thanks,
Jatinder

Jatinder S. wrote:

Any reasons?

Thanks,
Jatinder

Require is purely used to ‘embed’ files in other files.

Include is used on modules, and adds so-called “MixIn”-functionality.
It means you “import” the methods of the given Module into the current
class (or Module?).

So, basically, you have a Module that provides some semi-generic
functionality, then you have a class that wants to take advantage of
this functionality.

Example:

module A
def b
“bar”
end
end

class B
include A
end

foo = B.new
foo.b
=> “bar”

I hope this helps!

Ps. this explanation might be horrible, and it might be wrong; I’m not a
“professional” rubyist. :wink:

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