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Java, List only subdirectories from a directory, not files
...rn true. In order to see if the child is a subdirectory or not you need to test that child.
File file = new File("/path/to/directory");
String[] directories = file.list(new FilenameFilter() {
@Override
public boolean accept(File current, String name) {
return new File(current, name).isDirec...
Haskell offline documentation?
...tiple databases into one
convert Convert an input file to a database
test Run tests
dump Dump sections of a database to stdout
rank Generate ranking information
log Analyse log files
Common flags:
-? --help Display help message
-V --version Print version in...
How do I check if a column is empty or null in MySQL?
... '' = ' ' works in SQLServer but not in SQLite, as far as I can tell, from testing it now.
– Magne
Oct 3 '17 at 9:59
add a comment
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How do I prevent the modification of a private field in a class?
...ll never change
Here is a simple example of how to use it:
public class Test
{
private String[] arr = new String[]{"1","2"};
public ImmutableList<String> getArr()
{
return ImmutableList.copyOf(arr);
}
}
...
jQuery Determine if a matched class has a given id
...that lets your determine whether an element has certain qualities. You can test a jQuery collection against a string selector, an HTML Element, or another jQuery object. In this case, we'll just check it against a string selector:
$(".bar:first").is("#foo"); // TRUE if first '.bar' in document is a...
Iterate over each line in a string in PHP
...lse) {
# do something with $line
$line = strtok( $separator );
}
Testing the performance, I iterated 100 times over a test file with 17 thousand lines: preg_split took 27.7 seconds, whereas strtok took 1.4 seconds.
Note that though the $separator is defined as "\r\n", strtok will separate...
Display numbers with ordinal suffix in PHP
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@HafezDivandari - are you sure? Just tested with 7.1.19 and seems to work fine
– Iacopo
Dec 5 '18 at 9:35
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Stack Memory vs Heap Memory [duplicate]
... case of C++, the code is not run in either the stack or the heap. You can test what happens if you run out of heap memory by repeatingly calling new to allocate memory in a loop without calling delete to free it it. But make a system backup before doing this.
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How do I replace NA values with zeros in an R dataframe?
...ults.
If you are struggling with massive dataframes, data.table is the fastest option of all: 40% faster than the standard Base R approach. It also modifies the data in place, effectively allowing you to work with nearly twice as much of the data at once.
A clustering of other helpful tidyverse ...
How to make an anchor tag refer to nothing?
... It seems that href="javascript:" is also enough and works in the latest major browsers. No need for the semicolon, in fact PhpStorm even suggests to remove it.
– jlh
Jul 24 '17 at 13:37
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