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how do I query sql for a latest record date for each user
... Careful with this approach: it can return more than one row per user if they have more than one record per date (max(date) would return a date that would join multiple records). To avoid this issue, it would be preferable to use @dotjoe's solution: stackoverflow.com/a/2411763/4406793.
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How to load images dynamically (or lazily) when users scrolls them into view
...of images.
Plugin
Demo
EDIT: How do these plugins work?
This is a simplified explanation:
Find window size and find the position of all images and their sizes
If the image is not within the window size, replace it with a placeholder of same size
When user scrolls down, and position of image &l...
The order of keys in dictionaries
... is the insertion order; the keys will only come out in alphabetical order if you inserted them that way.
– Hugh Bothwell
Apr 12 '11 at 1:10
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What is the use for IHttpHandler.IsReusable?
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This property indicates if multiple requests can be processed with the same IHttpHandler instance. By default at the end of a request pipeline all http handlers that are placed in the handlerRecycleList of the HttpApplication are set to null. If a h...
Table Header Views in StoryBoards
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This only seems to work if you have at least one prototype cell in the table.
– Accatyyc
Nov 28 '12 at 10:31
4
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Easy way to turn JavaScript array into comma-separated list?
... to iterate through the array and build the string myself by concatenation if that's the only way.)
17 Answers
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In Python, how do I create a string of n characters in one line of code?
...me letter 10 times:
string_val = "x" * 10 # gives you "xxxxxxxxxx"
And if you want something more complex, like n random lowercase letters, it's still only one line of code (not counting the import statements and defining n):
from random import choice
from string import ascii_lowercase
n = 10
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How can I get the intersection, union, and subset of arrays in Ruby?
I want to create different methods for a class called Multiset .
3 Answers
3
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Logger slf4j advantages of formatting with {} instead of string concatenation
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It is about string concatenation performance. It's potentially significant if your have dense logging statements.
(Prior to SLF4J 1.7) But only two parameters are possible
Because the vast majority of logging statements have 2 or fewer parameters, so SLF4J API up to version 1.6 covers ...
Testing the type of a DOM element in JavaScript
...M element.
In that case, use the elem.tagName or elem.nodeName property.
if you want to get really creative, you can use a dictionary of tagnames and anonymous closures instead if a switch or if/else.
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