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Why does Ruby have both private and protected methods?
... the defining class or its subclasses.
private methods can be called only from within the calling object. You cannot access another instance's private methods directly.
Here is a quick practical example:
def compare_to(x)
self.some_method <=> x.some_method
end
some_method cannot be priv...
Meaning of @classmethod and @staticmethod for beginner? [duplicate]
... self.month = month
self.year = year
@classmethod
def from_string(cls, date_as_string):
day, month, year = map(int, date_as_string.split('-'))
date1 = cls(day, month, year)
return date1
@staticmethod
def is_date_valid(date_as_string):
day...
What is the difference between compile and link function in angularjs
...ctive to render an updated instance value to the DOM -- by copying content from the instance scope into the DOM.
Note that DOM transformations can be done in the compile function and/or the link function.
Most directives only need a link function, since most directives only deal with a specific D...
Traversing text in Insert mode
... and you'll get used to it soon. If you made a mistake ten characters back from your cursor, you'll find out that pressing the ← key 10 times is much slower than the iterative approach to moving the cursor. So you can instead quickly type the keys 12h (as a rough of guess how many characters back ...
Why does NULL = NULL evaluate to false in SQL server
...
SQL NULL is not any different from IEEE floating point NaN, where you also have (NaN == NaN) == false && (NaN != Nan) == false && (NaN < NaN) == false && ... - because, well, if it's not a number, you just can't say much about i...
stopPropagation vs. stopImmediatePropagation
...
stopPropagation will prevent any parent handlers from being executed stopImmediatePropagation will prevent any parent handlers and also any other handlers from executing
Quick example from the jquery documentation:
$("p").click(function(event) {
event.stopImmedia...
Going from a framework to no-framework [closed]
...ibrary.
Use filter_input_array to declaratively sanitize stuff coming in from the outside.
Access your database via PDO with parameterized SQL to prevent SQL injection attacks.
Use the following PHP settings to make your site more resistant to session fixation and cookie theft:
session.use_only...
Why does Math.Round(2.5) return 2 instead of 3?
...earest,
or banker's rounding. It minimizes
rounding errors that result from
consistently rounding a midpoint value
in a single direction.
You can specify how Math.Round should round mid-points using an overload which takes a MidpointRounding value. There's one overload with a MidpointRound...
Add line break to 'git commit -m' from the command line
I am using Git from the command line and am trying to add a line break to the commit message (using git commit -m "" ) without going into Vim.
...
Extending from two classes
...
You can only Extend a single class. And implement Interfaces from many sources.
Extending multiple classes is not available. The only solution I can think of is not inheriting either class but instead having an internal variable of each class and doing more of a proxy by redirecting ...