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The differences between .build, .create, and .create! and when should they be used?
...ver, is that these methods can be called through an association (has_many, etc.) to automatically link the two models.
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CFLAGS vs CPPFLAGS
...it in CPPFLAGS, if it's for a specific language put it in CFLAGS, CXXFLAGS etc. Examples of the latter type include standard compliance or warning flags - you wouldn't want to pass -std=c99 to your C++ compiler!
You might then end up with something like this in your makefile
CPPFLAGS=-I/usr/includ...
express.js - single routing handler for multiple routes in a single line
..., 'altPath'].forEach(function(path) {
app.get(path, function(req, res) { etc. });
});
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In Vim, how do I apply a macro to a set of lines?
...but all lines till end.. and still take care of the new line, doing stuff, etc.
– ihightower
Jan 19 '19 at 15:42
2
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how to make a whole row in a table clickable as a link?
...irefox), navigation (tab key), Copy link location, Open in new tab/window, etc. even for accessible / special needs browsers. My only nitpick is that I wouldn't nest a <div> inside an <a>, so the cells would be better marked up as <span>.
– Tobia
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How to change line width in ggplot?
...ze_manual," this is the same procedure for picking the color, fill, alpha, etc.
library(ggplot2)
library(tidyr)
x = seq(0,10,0.05)
df <- data.frame(A = 2 * x + 10,
B = x**2 - x*6,
C = 30 - x**1.5,
X = x)
df = gather(df,A,B,C,key="Model",valu...
Quick-and-dirty way to ensure only one instance of a shell script is running at a time
...ely easy to reliably obtain exclusive locks without worrying about cleanup etc. There are examples on the man page as to how to use it in a shell script.
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Deploy a project using Git push
...on't pre-configure the location of your amazon-private-key.pem, either in /etc/ssh/ssh_config as an IdentityFile parameter or in ~/.ssh/config using the "[Host] - HostName - IdentityFile - User" layout described here...
...HOWEVER if Host is configured in ~/.ssh/config and different than HostName ...
Observer Design Pattern vs “Listeners”
...of log messages (e.g. write to console, write to file, write to event log, etc.) In terms of patterns, while the overall .Net trace functionality employs several patterns (Plugin, Iterator), looping over a collection of objects which all conform to the same interface is really just plane jane polym...
“static const” vs “#define” vs “enum”
...n alternative:
#ifdef VAR // Very bad name, not long enough, too general, etc..
static int const var = VAR;
#else
static int const var = 5; // default value
#endif
Whenever possible, instead of macros / ellipsis, use a type-safe alternative.
If you really NEED to go with a macro (for example...