Re: How to test if the current line contains only white-spache?

[Emanuel Berg]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> Btw, what should this -p naming convention signal
>> to me?
>
> That it's a "p"redicate.

Here [1] it says

    A predicate is a function that tests for some
    condition involving its arguments and returns nil
    if the condition is false, or some non-nil value
    if the condition is true.

[1] https://www.cs.cmu.edu/Groups/AI/html/cltl/clm/node69.html

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