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When to use enumerateObjectsUsingBlock vs. for
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Ultimately, use whichever pattern you want to use and comes more naturally in the context.
While for(... in ...) is quite convenient and syntactically brief, enumerateObjectsUsingBlock: has a number of features that may or may not prove interesting:
enumerateObjectsUsingBlock: will be as fas...
Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...e expression is null, but also when it's undefined, false, 0, or the empty string.
– Cameron
Jul 7 '11 at 16:41
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Get names of all keys in the collection
I'd like to get the names of all the keys in a MongoDB collection.
21 Answers
21
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Location of parenthesis for auto-executing anonymous JavaScript functions?
... As you can see in this video!!.
The only reason for the existence of the extra wrapping () {in both styles} is to help make that section of code Function Expression, because Function Declaration cannot be immediately called. Some scripts / minify-ers just use +, !, - & ~ instead of too parenth...
Render HTML to PDF in Django site
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Try the solution from Reportlab.
Download it and install it as usual with python setup.py install
You will also need to install the following modules: xhtml2pdf, html5lib, pypdf with easy_install.
Here is an usage example:
First define this function:
import cStringIO as Str...
NASM x86汇编入门指南 - C/C++ - 清泛网 - 专注C/C++及内核技术
...例子：
Linux
DOS
;proc fileWrite – write a string to a file
fileWrite:
mov eax,4 ;write system call
mov ebx,[filedesc] ;File descriptor
mov ecx,stuffToWrite
mov edx,[stuffLen]
int 80h
ret
;endp fileWrite
proc fileWrite
mov ah,40h ...
“The Controls collection cannot be modified because the control contains code blocks”
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Or better, use a placeholder so no extra html code is output.
– Chris Haines
Sep 13 '13 at 11:13
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Python constructors and __init__
Why are constructors indeed called "Constructors"? What is their purpose and how are they different from methods in a class?
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YouTube Video Embedded via iframe Ignoring z-index?
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@Dan, see my edit... you might already have a query string in your youtube embed code. (like ?rel=0 to not show relevant videos). If that's the case use &wmode=transparent (or opaque - I've heard opaque uses less system resources, so I use that mainly, unless I have a re...
What's the difference between lists and tuples?
.... A list on the other hand could be used to store multiple locations. Naturally one might want to add or remove locations from the list, so it makes sense that lists are mutable. On the other hand it doesn't make sense to add or remove items from an existing location - hence tuples are immutable.
T...