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How can I check for “undefined” in JavaScript? [duplicate]
... follow this rule, good for you: you aren't a hypocrite.
The thing is, in order to do lots of real work in JS, developers need to rely on redefinable identifiers to be what they are. I don't hear people telling me that I shouldn't use setTimeout because someone can
window.setTimeout = function () ...
How to import existing *.sql files in PostgreSQL 8.4?
... 1.sql
\i 2.sql
Note that you may need to import the files in a specific order (for example: data definition before data manipulation). If you've got bash shell (GNU/Linux, Mac OS X, Cygwin) and the files may be imported in the alphabetical order, you may use this command:
for f in *.sql ; do ps...
Comparing Java enum members: == or equals()?
...
@Nivas: why not? Do you like worrying about the order of your arguments (which only applies to comparing constants from the left, as in Pascal's answer)? Do you like always checking that a value is not null before .equals()ing it? I know I don't.
– Ma...
Access lapply index names inside FUN
...e indices of x, but also pass in x and the names of x. As you can see, the order of the function arguments can be anything - lapply will pass in the "element" (here the index) to the first argument not specified among the extra ones. In this case, I specify y and n, so there's only i left...
Which ...
Difference between wait() and sleep()
...it just packs the context and stops executing for a predefined time. So in order to wake it up before the due time, you need to know the Thread reference. This is not a common situation in a multi-threaded environment. It's mostly used for time-synchronization (e.g. wake in exactly 3.5 seconds) and/...
How do I upload a file with metadata using a REST web service?
... due to a weird business rule, we have to allow the upload to occur in any order (metadata first or file first). I was wondering if there was a way to combine the two in order to save the headache of dealing with both situations.
– Daniel T.
Oct 15 '10 at 19:56...
Logical operators for boolean indexing in Pandas
... < 3 as df.A > (2 &
df.B) < 3, while the desired evaluation order is (df.A > 2) & (df.B <
3).
So, with this in mind, element wise logical AND can be implemented with the bitwise operator &:
df['A'] < 5
0 False
1 True
2 True
3 True
4 False
Name...
typedef struct vs struct definitions [duplicate]
...u have to declare struct variables like:
struct myStruct myVariable;
In order to be able to use myStruct myVariable; instead, you can typedef the struct:
typedef struct myStruct someStruct;
someStruct myVariable;
You can combine struct definition and typedefs it in a single statement which dec...
What is a Y-combinator? [closed]
...guy by the name of
Haskell Curry has a neat trick, if you have good higher order
functions then you only need functions of 1 variable. The
proof is that you can get from functions of 2 (or more in the
general case) variables to 1 variable with a purely
mechanical text transformation like this:
// ...
How to use Sphinx's autodoc to document a class's __init__(self) method?
... How do I use this? It seems the method must be named setup(app) in order to be executed by Sphinx.
– oarfish
Aug 16 '18 at 13:46
...