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How can I wait for set of asynchronous callback functions?
.... Let's say you have 10 ajax calls and you want to accumulate the results from those 10 ajax calls and then when they have all completed you want to do something. You can do it like this by accumulating the data in an array and keeping track of when the last one has finished:
Manual Counter
var ...
Convert Data URI to File then append to FormData
...t works with WebKit browsers. Part of the task is to extract an image file from the canvas object and append it to a FormData object for upload.
...
getActivity() returns null in Fragment function
...s. The onAttach call is where the Fragment is attached to its activity and from this point getActivity() will return non-null (nb there is also an onDetach() call).
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Compile time string hashing
...absolutely. I tested it against the Python CRC32 runtime algorithm (coming from zlib) and the results are the same. In fact, what you're trying to achieve is exactly why I use this technique for!
– Clement JACOB
Aug 23 '13 at 7:07
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Does PowerShell support constants?
...on for defining a constant like this:
const myConst = 42
Solution taken from http://poshcode.org/4063
function Set-Constant {
<#
.SYNOPSIS
Creates constants.
.DESCRIPTION
This function can help you to create constants so easy as it possible.
It works as k...
How to check if a word is an English word with Python?
...ibility based on NLTK without enchant is NLTK's words corpus
>>> from nltk.corpus import words
>>> "would" in words.words()
True
>>> "could" in words.words()
True
>>> "should" in words.words()
True
>>> "I" in words.words()
True
>>> "you" in word...
Preview an image before it is uploaded
.... The most efficient way would be to use URL.createObjectURL() on the File from your <input>. Pass this URL to img.src to tell the browser to load the provided image.
Here's an example:
<input type="file" accept="image/*" onchange="loadFile(event)">
<img id="output"/>
<...
Should you always favor xrange() over range()?
... dang well and is just as fast as xrange for when it counts (iterations).
from __future__ import division
def read_xrange(xrange_object):
# returns the xrange object's start, stop, and step
start = xrange_object[0]
if len(xrange_object) > 1:
step = xrange_object[1] - xrange_o...
Java HashMap performance optimization / alternative
... making up a simple example.) If your strings have widely varying lengths, from 1 to 10,000, and are fairly evenly distributed across that range, that this could be a very good hash function. But if your strings are all 1 or 2 characters, this would be a very bad hash function.
Edit: I should add: ...
Maven project version inheritance - do I have to specify the parent version?
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@halil The question is about inheriting a version from a parent with the goal to have the same version in two artifacts. If you have different parents with different versions (in an inheritance hierarchy) you probably will not make them all the same version. I therefore do n...