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What exactly is Arel in Rails 3.0?
...e?
Yes. For example, as I mentioned above, it is much easier to construct more complex queries from simpler parts.
will it lead to more efficient SQL queries?
Yes. The fact that ARel has a proper object model for the queries means that it can perform optimizations on those queries long before it ...
What should I name a table that maps two tables together? [closed]
...ight convey better what the table is about.
The name Subscription also is more idiomatic in case you want to map the table to objects later on.
The convention for naming many-to-many tables is a concatenation of the names of both tables that are involved in the relation. ColourShape would be a sen...
Get protocol, domain, and port from URL
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Why should we typedef a struct so often in C?
... keystrokes, it also can make the code cleaner since it provides a smidgen more abstraction.
Stuff like
typedef struct {
int x, y;
} Point;
Point point_new(int x, int y)
{
Point a;
a.x = x;
a.y = y;
return a;
}
becomes cleaner when you don't need to see the "struct" keyword all over t...
Should I always use a parallel stream when possible?
..., adding an additional layer of parallelism inside each request could have more negative than positive effects)
In your example, the performance will anyway be driven by the synchronized access to System.out.println(), and making this process parallel will have no effect, or even a negative one.
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How can I properly handle 404 in ASP.NET MVC?
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What's the difference between SCSS and Sass?
From what I've been reading, Sass is a language that makes CSS more powerful with variable and math support.
13 Answers
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Gradient of n colors ranging from color 1 and color 2
...u can give the resulting vector of colours to colorRampPalette to generate more colours along that ramp. For example: colorRampPalette(brewer.pal(8, "Spectral")).
– jbaums
Apr 30 '14 at 23:15
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Pointers vs. values in parameters and return values
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One case where you should often use a pointer:
Receivers are pointers more often than other arguments. It's not unusual for methods to modify the thing they're called on, or for named types to be large structs, so the guidance is to default to pointers except in rare cases.
Jeff Hodges' copyfi...