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How can jQuery deferred be used?
...che = {};
function getData( val ){
// return either the cached value or jqXHR object wrapped Promise
return $.when(
cache[ val ] ||
$.ajax('/foo/', {
data: { value: val },
dataType: 'json',
success: function( resp ){
cach...
What is a “Bitmap heap scan” in a query plan?
..."Bitmap heap scan", I know this often happens
when I execute a query with OR in the condition.
1 Answer
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
...tion are not a delimited list of operands, but a single expression.
Read more about the comma operator here.
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Loading and parsing a JSON file with multiple JSON objects
...
You have a JSON Lines format text file. You need to parse your file line by line:
import json
data = []
with open('file') as f:
for line in f:
data.append(json.loads(line))
Each line contains valid JSON, but as a whole, it is not a ...
What does status=canceled for a resource mean in Chrome Developer Tools?
...r problem where Chrome was canceling requests to load things within frames or iframes, but only intermittently and it seemed dependent on the computer and/or the speed of the internet connection.
This information is a few months out of date, but I built Chromium from scratch, dug through the source...
What is the purpose of “!” and “?” at the end of method names?
...
It's "just sugarcoating" for readability, but they do have common meanings:
Methods ending in ! perform some permanent or potentially dangerous change; for example:
Enumerable#sort returns a sorted version of the object while Enumerable#sort! sorts...
Find all files in a directory with extension .txt in Python
How can I find all the files in a directory having the extension .txt in python?
26 Answers
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logger configuration to log to file and print to stdout
...m using Python's logging module to log some debug strings to a file which works pretty well. Now in addition, I'd like to use this module to also print the strings out to stdout. How do I do this? In order to log my strings to a file I use following code:
...
Returning redirect as response to XHR request
... 302 redirect leads to a 200, then your program acts identically as if the original request led directly to a 200.
This has been both my experience and the behavior called out in the spec.
2016 Update: Time has passed, and the good news is that the new fetch() API is spec'd to offer finer-grained ...
Why are empty catch blocks a bad idea? [closed]
...ly empty try-catch is a bad idea because you are silently swallowing an error condition and then continuing execution. Occasionally this may be the right thing to do, but often it's a sign that a developer saw an exception, didn't know what to do about it, and so used an empty catch to silence the ...