Posix character classes use a [:alpha:] notation, which are used inside a regular expression like: /[[:alpha:][:digit:]]/ You’ll need to scroll down a ways to get to the Posix information in the link above. From the docs: POSIX bracket expressions are also similar to character classes. They provide a portable alternative to the above, with the … Read more
This JavaScript returns an array where each even index plays the next odd index function seeding(numPlayers){ var rounds = Math.log(numPlayers)/Math.log(2)-1; var pls = [1,2]; for(var i=0;i<rounds;i++){ pls = nextLayer(pls); } return pls; function nextLayer(pls){ var out=[]; var length = pls.length*2+1; pls.forEach(function(d){ out.push(d); out.push(length-d); }); return out; } } > seeding(2) [1, 2] > seeding(4) [1, … Read more
They are used to put Attributes on classes or methods (or other stuff). That way, you can attach data to classes that should not be part of the actual class. You can read more on them here
You can use re.findall() to find all numbers within the parenthesis: >>> import re >>> l = [ … “PIC S9(02)V9(05).”, … “PIC S9(04).”, … “PIC S9(03).”, … “PIC S9(03)V9(03).”, … “PIC S9(02)V9(03).”, … “PIC S9(04).”, … “PIC S9(13)V9(03).” … ] >>> pattern = re.compile(r”\((\d+)\)”) >>> for item in l: … print(pattern.findall(item)) … [’02’, ’05’] … Read more
For those of us, who want a vanilla vim: inoremap ” “”<left> inoremap ‘ ”<left> inoremap ( ()<left> inoremap [ []<left> inoremap { {}<left> inoremap {<CR> {<CR>}<ESC>O inoremap {;<CR> {<CR>};<ESC>O This autocomplete in insert mode, provided set paste is not set. Keep it in the vimrc to avoid typing it every time and when we … Read more
That’s called Type Assertion or casting. These are the same: let square = <Square>{}; let square = {} as Square; Example: interface Props { x: number; y: number; name: string; } let a = {}; a.x = 3; // error: Property ‘x’ does not exist on type `{}` So you can do: let a = … Read more
This is the official FAQ answer minus any subsequent edits. Your first try should probably be the Text::Balanced module, which is in the Perl standard library since Perl 5.8. It has a variety of functions to deal with tricky text. The Regexp::Common module can also help by providing canned patterns you can use. As of … Read more
Everything that is in square brackets is optional, i.e. you can omit it. If the square brackets contain more than 1 argument, you can’t choose which ones to omit, you must either specify all of them, or none. That’s where nested brackets come in handy: int([x[, base]]) Here, for example, you can use int() without … Read more
you can do if else statements like this: <?php if ($something) { echo ‘one conditional line of code’; echo ‘another conditional line of code’; } if ($something) echo ‘one conditional line of code’; if ($something) echo ‘one conditional line of code’; echo ‘a NON-conditional line of code’; // this line gets executed regardless of the … Read more
Or this pyparsing version: >>> from pyparsing import nestedExpr >>> txt = “{ { a } { b } { { { c } } } }” >>> >>> nestedExpr(‘{‘,’}’).parseString(txt).asList() [[[‘a’], [‘b’], [[[‘c’]]]]] >>>