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How can I check for “undefined” in JavaScript? [duplicate]
... use setTimeout because someone can
window.setTimeout = function () {
alert("Got you now!");
};
Bottom line, the "it can be redefined" argument to not use a raw === undefined is bogus.
(If you are still scared of undefined being redefined, why are you blindly integrating untested library co...
Bash script to calculate time elapsed
I am writing a script in bash to calculate the time elapsed for the execution of my commands, consider:
10 Answers
...
How do I get the full path of the current file's directory?
...
Python 3
For the directory of the script being run:
import pathlib
pathlib.Path(__file__).parent.absolute()
For the current working directory:
import pathlib
pathlib.Path().absolute()
Python 2 and 3
For the directory of the script being run:
import os...
Is there a “goto” statement in bash?
...
If you are using it to skip part of a large script for debugging (see Karl Nicoll's comment), then if false could be a good option (not sure if "false" is always available, for me it is in /bin/false):
# ... Code I want to run here ...
if false; then
# ... Code I wa...
Is there a minlength validation attribute in HTML5?
...ins/Validation/Methods/minlength
<html>
<head>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="http://jzaefferer.github.com/jquery-validation/jquery.validate.js"></script>
<script t...
Using Razor within JavaScript
Is it possible or is there a workaround to use Razor syntax within JavaScript that is in a view ( cshtml )?
12 Answers
...
How to install both Python 2.x and Python 3.x in Windows
...ble (to default on double click):
Name: PY_PYTHON
Value: 3
To launch a script in a particular interpreter, add the following shebang (beginning of script):
#! python2
To execute a script using a specific interpreter, use the following prompt command:
> py -2 MyScript.py
To launch a spec...
How do I detect when someone shakes an iPhone?
...milar (in iPhone OS 3.0+), only in my case I wanted it app-wide so I could alert various parts of the app when a shake occurred. Here's what I ended up doing.
First, I subclassed UIWindow. This is easy peasy. Create a new class file with an interface such as MotionWindow : UIWindow (feel free to pi...
Ruby off the rails
...d.
My domain is usually client-side Windows applications (wxRuby GUI) and scripts, automating Excel, Internet Explorer, SQL Server queries and report generation (win32ole COM automation). I also use the sqlite, pdf-writer, and gruff libraries for various data munging and graph generation tasks.
Ra...
How do I correctly clone a JavaScript object?
...ion after 5 seconds. */
setTimeout(function(){
var d2 = clone(d1);
alert("d1 = " + d1.toString() + "\nd2 = " + d2.toString());
}, 5000);
The date string for d1 will be 5 seconds behind that of d2. A way to make one Date the same as another is by calling the setTime method, but that is spec...