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When should we use Observer and Observable?
...ependent objects.
Examples
Let's say, your permanent address is changed then you need to notify passport authority and pan card authority. So here passport authority and pan card authority are observers and You are a subject.
On Facebook also, If you subscribe to someone then whenever new updates...
Play/pause HTML 5 video using JQuery
...es. I am trying to make the video clips play when their tab is clicked and then stop when any of the others are clicked.
19...
Ajax using https on an http page
...use an iframe to do the query.
if you're not using JSON for your payload, then you'll have to roll your own mechanism around the iframe.
personally, i'd just redirect form the http:// page to the https:// one
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Reading Xml with XmlReader in C#
... reader.ReadStartElement("theRootElement");
while (reader.Name == "TheNodeIWant")
{
XElement el = (XElement) XNode.ReadFrom(reader);
}
reader.ReadEndElement();
}
This takes care of "a read too far" problem because it implements the classic while loop pattern:
initial ...
How to Store Historical Data
...tables of the sort described above. If you have more complex requirements then it may be more economical to implement a data mart for the reporting than to try and integrate history directly into the operational system.Slowly changing dimensions are by far the simplest mechanism for tracking and qu...
Python Pandas merge only certain columns
...
You can use .loc to select the specific columns with all rows and then pull that. An example is below:
pandas.merge(dataframe1, dataframe2.iloc[:, [0:5]], how='left', on='key')
In this example, you are merging dataframe1 and dataframe2. You have chosen to do an outer left join on 'key'. ...
git stash apply version
...
git stash list
then select the stash to apply and use only number:
git stash apply 1
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Create a new database with MySQL Workbench
... 6.0 CE.
You launch MySQL Workbench.
From Menu Bar click on Database and then select "Connect to Database"
It by default showing you default settings other wise you choose you host name, user name and password. and click to ok.
As in above define that you should click write on existing database bu...
The new keyword “auto”; When should it be used to declare a variable type? [duplicate]
...known amongst the co-programmers who work (or would work) in your project, then auto can be used, such as in the following code:
//good : auto increases readability here
for(auto it = v.begin(); it != v.end(); ++it) //v is some [std] container
{
//..
}
Or, more generally,
//good : auto inc...
Why do we need fibers
...control primitive which you can use to build other abstractions, which you then use in higher-level code.
Probably the #1 use of fibers in Ruby is to implement Enumerators, which are a core Ruby class in Ruby 1.9. These are incredibly useful.
In Ruby 1.9, if you call almost any iterator method on ...