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dypsilon
/ frontendDevlopmentBookmarks.md
Last active
November 10, 2024 03:45
A badass list of frontend development resources I collected over time.
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| /* jshint browser: true, devel: true */ | |
| /** | |
| * preg_replace (from PHP) in JavaScript! | |
| * | |
| * This is basically a pattern replace. You can use a regex pattern to search and | |
| * another for the replace. For more information see the PHP docs on the original | |
| * function (http://php.net/manual/en/function.preg-replace.php), and for more on | |
| * JavaScript flavour regex visit http://www.regular-expressions.info/javascript.html | |
| * |
Magic numbers are the first bits of a file which uniquely identify the type of file. This makes programming easier because complicated file structures need not be searched in order to identify the file type.
For example, a jpeg file starts with ffd8 ffe0 0010 4a46 4946 0001 0101 0047 ......JFIF.....G ffd8 shows that it's a JPEG file, and ffe0 identify a JFIF type structure. There is an ascii encoding of "JFIF" which comes after a length code, but that is not necessary in order to identify the file. The first 4 bytes do that uniquely.
This gives an ongoing list of file-type magic numbers.