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What are the Ruby Gotchas a newbie should be warned about? [closed]
...s.
To denote floating point numbers, one must follow with a zero digit (99.0) or an explicit conversion (99.to_f). It is insufficient to append a dot (99.), because numbers are susceptible to method syntax.
Boolean evaluation of non-boolean data is strict: 0, "" and [] are all evaluated to true. In ...
Remove elements from collection while iterating
...Book> books = new ArrayList<Book>();
books.add(new Book(new ISBN("0-201-63361-2")));
books.add(new Book(new ISBN("0-201-63361-3")));
books.add(new Book(new ISBN("0-201-63361-4")));
Collect and Remove
The first technique consists in collecting all the objects that we want to delete (e.g. ...
Relative paths based on file location instead of current working directory [duplicate]
... to do is get the absolute path of the script (available via ${BASH_SOURCE[0]}) and then use this to get the parent directory and cd to it at the beginning of the script.
#!/bin/bash
parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
cd "$parent_path"
cat ../some.text
This will make y...
Uri to default sound notification?
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edited Jun 30 '12 at 6:54
answered Jun 30 '12 at 6:37
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Side-by-side plots with ggplot2
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answered Oct 14 '10 at 16:52
David LeBauerDavid LeBauer
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Difference between Control Template and DataTemplate in WPF
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answered Aug 27 '09 at 10:20
Matt HamiltonMatt Hamilton
183k5959 gold badges376376 silver badges317317 bronze badges
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Git command to display HEAD commit id?
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Jorge Ferreira
85.8k2323 gold badges107107 silver badges129129 bronze badges
answered Dec 28 '09 at 4:44
Randal SchwartzRandal Schwartz
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How can I get enum possible values in a MySQL database?
...gt;query( "SHOW COLUMNS FROM {$table} WHERE Field = '{$field}'" )->row( 0 )->Type;
preg_match("/^enum\(\'(.*)\'\)$/", $type, $matches);
$enum = explode("','", $matches[1]);
return $enum;
}
share
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Unignore subdirectories of ignored directories in Git
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edited Feb 17 '18 at 14:02
Buo-ren Lin
12077 bronze badges
answered Mar 12 '11 at 21:15
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Get first key in a (possibly) associative array?
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2019 Update
Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more ...