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How do you stash an untracked file?
... git stash to put them away while I switch to another task. But git stash by itself stashes only the changes to the existing file; the new file remains in my working tree, cluttering up my future work. How do I stash this untracked file?
...
Functional programming vs Object Oriented programming [closed]
...your code evolves, you primarily add new things. This can be accomplished by adding new classes which implement existing methods, and the existing classes are left alone.
Functional languages are good when you have a fixed set of things, and as your code evolves, you primarily add new operations o...
What's default HTML/CSS link color?
...on of IE.
If you are looking for a standardized color scheme that is used by all browsers rather than suggested by HTML5, then there isn't one. Neither is there a way to revert to a browser's default value for a particular property on a particular element using pure CSS. You will have to either use...
Key existence check in HashMap
...
You won't gain anything by checking that the key exists. This is the code of HashMap:
@Override
public boolean containsKey(Object key) {
Entry<K, V> m = getEntry(key);
return m != null;
}
@Override
public V get(Object key) {
Entr...
Ruby, !! operator (a/k/a the double-bang) [duplicate]
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In most programming languages, including Ruby, ! will return the opposite of the boolean value of the operand. So when you chain two exclamation marks together, it converts the value to a boolean.
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Writing a compiler in its own language
... Scala. Its first compiler was created in Pizza, an experimental language by Martin Odersky. As of version 2.0, the compiler was completely re-written in Scala. From that point on, the old Pizza compiler could be completely discarded, due to the fact that the new Scala compiler could be used to c...
Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
... the android
namespace.
Its used like this because this is a design choice by google to
handle the errors at compile time.
Also suppose we write our own textview widget with different
features compared to android textview, android namespace helps to
distinguish between our custom textview widget and...
What makes a SQL statement sargable?
By definition (at least from what I've seen) sargable means that a query is capable of having the query engine optimize the execution plan that the query uses. I've tried looking up the answers, but there doesn't seem to be a lot on the subject matter. So the question is, what does or doesn't make...
Using ping in c#
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Don't know how many people have used this answer by copy and paste :/ Do at least a using (var pinger = new Ping()) { .. } and are early returns so evil?
– Peter Schneider
Jan 31 '19 at 17:56
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Using DISTINCT and COUNT together in a MySQL Query
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Select count(*), productid
from products
where keyword = '$keyword'
group by productid
that will give you a list like
count(*) productid
----------------------
5 12345
3 93884
9 93493
This allows you to see how many of each distinct productid ID...