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What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
...ard term for them or where I can find more information on their use? I've read that they are similar to an 'if' 'else' statement.
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What makes Lisp macros so special?
Reading Paul Graham's essays on programming languages one would think that Lisp macros are the only way to go. As a busy developer, working on other platforms, I have not had the privilege of using Lisp macros. As someone who wants to understand the buzz, please explain what makes this feature s...
Find a Git branch containing changes to a given file
...)
FILENAME="<filename>"
git log --all --format=%H $FILENAME | while read f; do git branch --contains $f; done | sort -u
Manually inspect:
gitk --all --date-order -- $FILENAME
Find all changes to FILENAME not merged to master:
git for-each-ref --format="%(refname:short)" refs/heads | gre...
Safely remove migration In Laravel
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If the migration has been run (read: migrated) then you should roll back your migration to clear the history from your database table. Once you're rolled back you should be able to safely delete your migration file and then proceed with migrating again.
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Python: fastest way to create a list of n lists
...r more formal and can be extended in a variety of situations, after having read a dataset.
Method 1: Conceptual
X2=[]
X1=[1,2,3]
X2.append(X1)
X3=[4,5,6]
X2.append(X3)
X2 thus has [[1,2,3],[4,5,6]] ie a list of lists.
Method 2 : Formal and extensible
Another elegant way to store a list as a li...
Which is more efficient, a for-each loop, or an iterator?
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If you are just wandering over the collection to read all of the values, then there is no difference between using an iterator or the new for loop syntax, as the new syntax just uses the iterator underwater.
If however, you mean by loop the old "c-style" loop:
for(int i=0...
Using varchar(MAX) vs TEXT on SQL Server
I just read that the VARCHAR(MAX) datatype (which can store close to 2GB of char data) is the recommended replacement for the TEXT datatype in SQL Server 2005 and Next SQL SERVER versions.
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What is the best JavaScript code to create an img element
... in the above code, if the values weren't hard coded). It's also easier to read (from a JS perspective):
$('#container').append($('<img>', {
src : "/path/to/image.jpg",
width : 16,
height : 16,
alt : "Test Image",
title : "Test Image"
}));
...
What linux shell command returns a part of a string? [duplicate]
...irst slash (exactly what I wanted), you can do: cut -d/ -f-1, which can be read as "cut on substrings delimited by /, only return the first one".
– ArtOfWarfare
Sep 11 '17 at 14:31
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JPG vs. JPEG image formats
...between the two is. I have come across this question , and will certainly read through it, though at the moment I'm slightly out of time. However, from what I saw giving it a quick look, it seems not to distinguish the two extensions. In fact, it seems the file type's name is JPEG and the file ex...