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Catching multiple exception types in one catch block
...fining the exceptions). Even given that there are exceptions you want to "fall through", you should still be able to define a hierarchy to match your needs.
abstract class MyExceptions extends Exception {}
abstract class LetterError extends MyExceptions {}
class AError extends LetterError {}
cla...
Nginx缓存解决方案：SRCache - 更多技术 - 清泛网 - 专注C/C++及内核技术
... index, rule in ipairs(phoenix["rule"]) do
if type(rule["regex"]) == "string" then
rule["regex"] = {rule["regex"], ""}
end
local regex, options = table.unpack(rule["regex"])
if ngx.re.match(request_uri_without_args, regex, options) then
local default = phoen...
submit a form in a new tab
...to test some functions, after I'll avoid this behaviour) to load the page called by submit on a new tab : is it possible?
8...
encryption/decryption with multiple keys
..., AES-NI, to do some steps of the algorithm in hardware, which makes GnuPG extra snappy at encrypting/decrypting data.
Another reason for doing it this way is that it allows PGP-encrypted documents to be encrypted to multiple parties without having to double the size of the document. Notice that w...
Difference between EXISTS and IN in SQL?
...turns purely Boolean values, which is always faster than having to compare strings or values larger than a BIT/Boolean type. IN may or may not be a Boolean comparison. Since programming prefers EXPLICIT usage for stability (part of ACID), EXISTS is preferred generally.
– clift...
What does Google Closure Library offer over jQuery? [closed]
...tent.
like jQuery google closure allows traversing dom structure with the string-based queries using a dedicated component of the library.
closure library relies on dot-delimited namespaces more like Java - a very strong organizational feature.
using such namespaces will incur overhead in uncompi...
Why won't my PHP app send a 404 error?
...
Your code is technically correct. If you looked at the headers of that blank page, you'd see a 404 header, and other computers/programs would be able to correctly identify the response as file not found.
Of course, your users are still SOL. N...
TypeScript type signatures for functions with variable argument counts
...o the ... directly in the method:
class Header { constructor(public name: string, public value: string) {} }
getHeaders(...additionalHeaders: Header[]): HttpHeaders {
let headers = new HttpHeaders();
headers.append('Content-Type', 'application/json')
if (additionalHeaders && a...
Preloading images with JavaScript
Is the function I wrote below enough to preload images in most, if not all, browsers commonly used today?
14 Answers
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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
...
If the script is the same across all users, you can use a lockfile approach. If you acquire the lock, proceed else show a message and exit.
As an example:
[Terminal #1] $ lockfile -r 0 /tmp/the.lock
[Terminal #1] $
[Terminal #2] $ lockfile -r 0 /tmp/the....