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How can two strings be concatenated?
...ous posters pointed out, paste can do two things:
concatenate values into one "string", e.g.
> paste("Hello", "world", sep=" ")
[1] "Hello world"
where the argument sep specifies the character(s) to be used between the arguments to concatenate,
or collapse character vectors
> x <- c("H...
java: ArrayList - how can i check if an index exists?
...t(index) == null but that not working is why there are questions like this one
– roberto tomás
May 10 '16 at 19:10
...
How to return a value from __init__ in Python?
...
__init__ is required to return None. You cannot (or at least shouldn't) return something else.
Try making whatever you want to return an instance variable (or function).
>>> class Foo:
... def __init__(self):
... return 42
...
>&g...
How to add extension methods to Enums
...xtend them, like:
enum Duration { Day, Week, Month };
static class DurationExtensions
{
public static DateTime From(this Duration duration, DateTime dateTime)
{
switch (duration)
{
case Day: return dateTime.AddDays(1);
case Week: return dateTime.AddDays(7);
case...
How to pass command line arguments to a shell alias? [duplicate]
...ho "First: $1"; echo "Second: $2"; };_blah'
Running the following:
blah one two
Gives the output below:
First: one
Second: two
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Redis: Show database size/size for keys
...ying anything with DEBUG on AWS ElastiCache Redis, docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/…. Even found redis-cli --bigkeys would stall
– sonjz
Apr 12 '18 at 20:53
...
How do I load my script into the node.js REPL?
...p a new StackOverflow question if your question does not match an existing one :-)
– vossad01
Aug 21 '17 at 20:34
@Che...
How to get method parameter names?
...or you.
>>> inspect.getfullargspec(a_method)
(['arg1', 'arg2'], None, None, None)
The other results are the name of the *args and **kwargs variables, and the defaults provided. ie.
>>> def foo(a, b, c=4, *arglist, **keywords): pass
>>> inspect.getfullargspec(foo)
(['a...
sizeof single struct member in C
...
Although defining the buffer size with a #define is one idiomatic way to do it, another would be to use a macro like this:
#define member_size(type, member) sizeof(((type *)0)->member)
and use it like this:
typedef struct
{
float calc;
char text[255];
int us...
JavaScript file upload size validation
...
This one works grate but does it works for multiple files also?
– Ingus
Aug 15 '17 at 8:01
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