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Comparing numbers in Bash
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In bash, you should do your check in arithmetic context:
if (( a > b )); then
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fi
For POSIX shells that don't support (()), you can use -lt and -gt.
if [ "$a" -gt "$b" ]; then
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fi
You can get a full list of comparison operators with help test o...
How to create a custom exception type in Java? [duplicate]
...for example:
class WordContainsException extends Exception
{
// Parameterless Constructor
public WordContainsException() {}
// Constructor that accepts a message
public WordContainsException(String message)
{
super(message);
}
}
Usage:
try
{
if...
Align labels in form next to input
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How do I make this work if some of the labels are check-boxes or radio buttons? The labels for these elements end up with the same fixed width as the textbox labels which is not desired. Is there a way to do this without a fixed width on the label?
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Deprecated: mysql_connect()
...d be like this:
<?php
$connection = mysqli_connect('localhost', 'username', 'password', 'database');
To run database queries is also simple and nearly identical with the old way:
<?php
// Old way
mysql_query('CREATE TEMPORARY TABLE `table`', $connection);
// New way
mysqli_query($connectio...
How to only get file name with Linux 'find'?
... files in directory, so I get a list of paths. However, I need only file names. i.e. I get ./dir1/dir2/file.txt and I want to get file.txt
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How do I use Ruby for shell scripting?
I have some simple shell scripting tasks that I want to do
13 Answers
13
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Converting JSON data to Java object
...t to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson() . Below is an example of what the string can look like:
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How to get the screen width and height in iOS?
How can one get the dimensions of the screen in iOS?
16 Answers
16
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filter for complete cases in data.frame using dplyr (case-wise deletion)
Is it possible to filter a data.frame for complete cases using dplyr? complete.cases with a list of all variables works, of course. But that is a) verbose when there are a lot of variables and b) impossible when the variable names are not known (e.g. in a function that processes any data.frame).
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while (1) Vs. for (;;) Is there a speed difference?
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In perl, they result in the same opcodes:
$ perl -MO=Concise -e 'for(;;) { print "foo\n" }'
a <@> leave[1 ref] vKP/REFC ->(end)
1 <0> enter ->2
2 <;> nextstate(main 2 -e:1) v ->3
9 <2> leaveloop vK/2 ->a
3...