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Is it better to return null or empty collection?
...llection might mean "0 items", returning Null could mean "no collection at all" - eg. if you are parsing HTML, looking for an <ul> with id="foo", <ul id="foo"></ul> could return empty collection; if there is no <ul> with id="foo" a null return would be better (unless you want...
How to change the decimal separator of DecimalFormat from comma to dot/point?
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Side note: NumberFormat.getNumberInstance() can run unusually slowly on some Android 7 devices. An alternative is String.format() which runs quickly. See stackoverflow.com/questions/2379221/java-currency-number-format
– Mr-IDE
Oct 16 '17 at 5:...
How to wait until an element exists?
...atch the DOM. It's only supported in newer browsers though, so you should fall back onto DOMNodeInserted when MutationObserver isn't available.
let observer = new MutationObserver((mutations) => {
mutations.forEach((mutation) => {
if (!mutation.addedNodes) return
for (let i = 0; i &...
How can I connect to MySQL in Python 3 on Windows?
...oesn't have any dependencies.
This pure Python MySQL client provides a DB-API to a MySQL database by talking directly to the server via the binary client/server protocol.
Example:
import pymysql
conn = pymysql.connect(host='127.0.0.1', unix_socket='/tmp/mysql.sock', user='root', passwd=None, db='my...
Mozilla PDF.js：PDF在线预览 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...What browsers are supported?支持哪些浏览器?
The goal is to support all HTML5 compliant browsers, but sincefeature support varies per browser/version our support for all PDF featuresvaries as well. If you want to support more browsers than Firefox you'll needto include compatibility.jswhich h...
Is there a jQuery unfocus method?
...ht or make my text input un-focused. I knew .blur() existed but I didn't really understand the correct syntax for this usage. +1
– Partack
Jul 10 '13 at 21:32
7
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When should I use perror(“…”) and fprintf(stderr, “…”)?
...on call goes from user space to kernal space wheras fprintf calls goest to api to kernal
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How to document a method with parameter(s)?
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Actually there is a space missing before Description. I checked the numpy documentation, because I immediately noticed and thought "Wait a second, why is it three spaces? That's odd. Who'd use three spaces?"
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How to reference style attributes from a drawable?
... is well referenced, but same code runs on different pre-L devices and actually the attr reference doesn't work on pre-L devices! LoL.. So for me it is not fixed if I have to maintain different drawables anyway.
– Davideas
May 17 '15 at 8:48
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Replacement for Google Code Search? [closed]
...- I use it a couple times a week to see how other developers have used (usually poorly documented) APIs. It's also convenient to see the internals of some of those APIs, or to find which API corresponds to the functionality you want (it's a great resource for Android in particular -- give it some o...