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What is a lambda (function)?
... = x−1 means a function substituting the symbols x−1 for the symbol y. Now imagine applying λ y to each term in the first equation. If a term is y then perform the substitution; otherwise do nothing. If you do this out on paper you'll see how applying that λ y will make the first equation solv...
Set environment variables on Mac OS X Lion
...
Also it's useful to know about ~/.bashrc. ~/.bashrc file runs every time you open a new non-login bash shell such as xterm / aterm, and ~/.bash_profile runs only with login shells i.e when you first log in into system.
– Dan...
Rotating and spacing axis labels in ggplot2
...tor whose labels are long. While probably not an ideal visualization, for now I'd like to simply rotate these labels to be vertical. I've figured this part out with the code below, but as you can see, the labels aren't totally visible.
...
How do I hide a menu item in the actionbar?
...be null because you are using getItem instead of findItem. We could never know, without seeing both your code and crash log.
– K-ballo
May 21 '12 at 21:31
...
What does Ruby have that Python doesn't, and vice versa?
...or that claim language Y doesn't have X, although in fact it does. I also know exactly why I prefer Python, but that's also subjective, and wouldn't help anybody choosing, as they might not have the same tastes in development as I do.
...
Do zombies exist … in .NET?
... "zombie thread" crashing a system. I routinely use locking and I didn't know what a "zombie thread" was, so I asked. The impression I got from his explanation is that a zombie thread is a thread that has terminated but somehow still holds onto some resources. An example he gave of how a zombie t...
Ruby, remove last N characters from a string?
...in a fast and readable manner.
The docs on the methods are here.
If you know what the suffix is, this is idiomatic (and I'd argue, even more readable than other answers here):
'abc123'.delete_suffix('123') # => "abc"
'abc123'.delete_suffix!('123') # => "abc"
It's even significantly...
How to pass json POST data to Web API method as an object?
...lue)
{
return "Hello from http post web api controller: " + value;
}
Now, fire the following jQuery from your browser console
$.ajax({
type: 'POST',
url: 'http://localhost:33649/api/TestApi/TestMethod',
data: {'':'hello'},
contentType: 'application/x-www-form-urlencoded',
...
How does one unit test routes with Express?
...lly for unit tests and not integration tests. This is what I'm doing right now,
test('/api base path', function onTest(t) {
t.plan(1);
var path = routerObj.path;
t.equals(path, '/api');
});
test('Subrouters loaded', function onTest(t) {
t.plan(1);
var router = routerObj.router;
t....
Returning a C string from a function
...ing like "my string" actually uses 9+1 (=10!) bytes. This is important to know when you finally get around to allocating strings dynamically.
So, without this 'terminating zero', you don't have a string. You have an array of characters (also called a buffer) hanging around in memory.
Longevity of ...