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Array initializing in Scala
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scala> val arr = Array("Hello","World")
arr: Array[java.lang.String] = Array(Hello, World)
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Pointers vs. values in parameters and return values
...mb for receivers is, "If in doubt, use a pointer."
Slices, maps, channels, strings, function values, and interface values are implemented with pointers internally, and a pointer to them is often redundant.
Elsewhere, use pointers for big structs or structs you'll have to change, and otherwise pass v...
INSERT INTO…SELECT for all MySQL columns
... syntax, it looks like this (leave out the column list to implicitly mean "all")
INSERT INTO this_table_archive
SELECT *
FROM this_table
WHERE entry_date < '2011-01-01 00:00:00'
For avoiding primary key errors if you already have data in the archive table
INSERT INTO this_table_archive
SELECT...
What is your preferred style for naming variables in R? [closed]
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Good previous answers so just a little to add here:
underscores are really annoying for ESS users; given that ESS is pretty widely used you won't see many underscores in code authored by ESS users (and that set includes a bunch of R Core as well as CRAN authors, excptions like Hadley notwithsta...
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 is the difference between `sorted(list)` vs `list.sort()`?
...all in-place operations).
sorted() works on any iterable, not just lists. Strings, tuples, dictionaries (you'll get the keys), generators, etc., returning a list containing all elements, sorted.
Use list.sort() when you want to mutate the list, sorted() when you want a new sorted object back. Use...
What is the definition of “interface” in object oriented programming
... one of the more overloaded and confusing terms in development.
It is actually a concept of abstraction and encapsulation. For a given "box", it declares the "inputs" and "outputs" of that box. In the world of software, that usually means the operations that can be invoked on the box (along with ar...
Why does calling a function in the Node.js REPL with )( work?
Why is it possible to call function in JavaScript like this, tested with node.js:
3 Answers
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What is Lazy Loading?
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It's called lazy loading because, like a lazy person, you are putting off doing something you don't want to. The opposite is Eager Loading, where you load something right away, long before you need it.
If you are curious why peop...
JavaScript variable number of arguments to function
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Tnx. It is great for parsing Strings from android native code to javascript in a Webview.
– Johan Hoeksma
Aug 31 '13 at 16:06
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