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What is the difference between include and extend in Ruby?
...s they don't clash
It gives Klazz access to Mod's module variables, e.g. @@foo or @@bar
raises ArgumentError if there are cyclic includes
Attaches the module as the caller's immediate ancestor (i.e. It adds Mod to Klazz.ancestors, but Mod is not added to the chain of Klazz.superclass.superclass.supe...
How do I check in JavaScript if a value exists at a certain array index?
...
you can always replace foo !== 'undefined' && foo !== null with just foo != null
– thinklinux
Dec 7 '12 at 16:43
1
...
Regex for splitting a string using space when not surrounded by single or double quotes
...t "word"
}
}
Also, capturing single quotes could lead to issues:
"Foo's Bar 'n Grill"
//=>
"Foo"
"s Bar "
"n"
"Grill"
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What to do with “Unexpected indent” in python?
...me string of whitespace. For instance:
>>> def a():
... print "foo"
... print "bar"
IndentationError: unexpected indent
This one is especially common when running python interactively: make sure you don't put any extra spaces before your commands. (Very annoying when copy-and-pasti...
Foreign keys in mongo?
...Mongoid::Document
field :name
has_many :scores
end
Edit:
> db.foo.insert({group:"phones"})
> db.foo.find()
{ "_id" : ObjectId("4df6539ae90592692ccc9940"), "group" : "phones" }
{ "_id" : ObjectId("4df6540fe90592692ccc9941"), "group" : "phones" }
>db.foo.find({'_id...
When do I need to use a semicolon vs a slash in Oracle SQL?
....0 - Production
With the Partitioning and OLAP options
SQL> drop table foo;
Table dropped.
SQL> /
drop table foo
*
ERROR at line 1:
ORA-00942: table or view does not exist
In this case one actually notices the error.
But assuming there is a SQL script like this:
drop table...
Must Dependency Injection come at the expense of Encapsulation?
...er of the dependency must know both that the object in question requires a Foo, and the provider has to have a way of providing the Foo to the object.
Classically this latter case is handled as you say, through constructor arguments or setter methods. However, this is not necessarily true - I know...
What are the best practices to follow when declaring an array in Javascript?
...ed to create a different object.
(function () {
"use strict";
var foo,
bar;
//don't do this, it's a bad idea
function Array() {
alert('foo');
}
foo = new Array();
bar = [];
}());
In my example code, I've kept the Array function hidden from the rest o...
Should I use alias or alias_method?
...dict: Use alias_method - it gives you a ton more flexibility.
Usage:
def foo
"foo"
end
alias_method :baz, :foo
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jQuery event to trigger action when a div is made visible
...he clearInterval() upon successful call-out.
Here's an example:
function foo() {
$('.visibilityCheck').each(function() {
if ($(this).is(':visible')){
// do something
}
});
}
window.setInterval(foo, 100);
You can also perform some performance improvements on i...