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The necessity of hiding the salt for a hash
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@erickson, I think you are mixing up terminology here. Salts do not thwart dictionary attacks unless they are hidden. Alot of salts are stored openly. And if you know the salt, you're dictionary attack is only slowed by the time it takes to append t...
Adding two Java 8 streams, or an extra element to a stream
...ap(identity()) cast <? extends T> to <T>. It happens thanks to mix of java 8 'target types' of method arguments and return types and signature of map() method. Actually it is Function.<T>identity().
– kant
Sep 14 '14 at 19:18
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How to programmatically take a screenshot on Android?
...later for whatever your needs are:
First, you need to add a proper permission to save the file:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
And this is the code (running in an Activity):
private void takeScreenshot() {
Date now = new Date();
android...
How do you get a list of the names of all files present in a directory in Node.js?
...that the first one is asynchronous, so you have to provide a callback function that will be executed when the read process ends.
The second is synchronous, it will return the file name array, but it will stop any further execution of your code until the read process ends.
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What is the best way to dump entire objects to a log in C#?
...ing a current object's state at runtime, I really like what the Visual Studio Immediate window gives me. Just doing a simple
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How does an underscore in front of a variable in a cocoa objective-c class work?
...derscore prefix for your ivars (which is nothing more than a common convention, but a useful one), then you need to do 1 extra thing so the auto-generated accessor (for the property) knows which ivar to use. Specifically, in your implementation file, your synthesize should look like this:
@synthes...
How can I read input from the console using the Scanner class in Java?
...e input, or just validate the username variable.
You'll find more information on their implementation in the API Documentation for java.util.Scanner
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Spring schemaLocation fails when there is no internet connection
I am using Spring and in application-context.xml I have the following definitions:
18 Answers
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Apply pandas function to column to create multiple new columns?
...212 1.088212 -0.911788
EDIT:
Please be aware of the huge memory consumption and low speed: https://ys-l.github.io/posts/2015/08/28/how-not-to-use-pandas-apply/ !
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Group by with multiple columns using lambda
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I came up with a mix of defining a class like David's answer, but not requiring a Where class to go with it. It looks something like:
var resultsGroupings = resultsRecords.GroupBy(r => new { r.IdObj1, r.IdObj2, r.IdObj3})
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