dollar-sign

This question already has answers here : What does $ mean/do in Haskell? (2 answers) Closed 5 years ago . This happens in the situation you want to apply bunch of functions to the same variable, it may look like this: map (\f->f 4) [odd, even] but from LYAH using $ make it very neat map ($ 4) [odd, even] why does it work. first I type it in ghci like $ 4 odd , it failed, then I type ($ 4) odd , which works fine. then I check the type of ($ 4) using :t which shows ($ 4) :: Num a => (a -> b) -> b , odd is odd :: Integral a => a -> Bool . It seems make sense, but still not clear to me. Can anyone

I have a search string. When it contains a dollar symbol, I want to capture all characters thereafter, but not include the dot, or a subsequent dollar symbol.. The latter would constitute a subsequent match. So for either of these search strings...: "/bla/$V_N.$XYZ.bla"; "/bla/$V_N.$XYZ; I would want to return: V_N XYZ If the search string contains percent symbols, I also want to return what's between the pair of % symbols. The following regex seems do the trick for that. "%([^%]*?)%"; Inferring: Start and end with a %, Have a capture group - the () have a character class containing anything

Can I use the following in C++ ?: #define $ cout int main(){ $<<"Hello World!\n"; return 0; } I'm wondering whether it will cause any conflicts. It's not definitively legal , but your implementation is allowed to accept it. Consider: [C++11: 2.5/1]: Each preprocessing token that is converted to a token (2.7) shall have the lexical form of a keyword, an identifier, a literal, an operator, or a punctuator. Here, your $ is obviously not a keyword, operator or punctuator (as these are enumerated in the standard), and it doesn't look like a literal, so it could only be an identifier; now,

There is this jQuery which seems to look for all elements with id="scuba" , but then it uses attr() to pull the id out? Could "scuba" be part of the id and attr pulls the entire id out? I've never seen the $ inside an attribute selector, just outside like the example below. $('*[id$=scuba]').attr('id') So my questions are: What does the $ or $= do in this example What does this code do? The dollar sign The first $ is a shorthand for the jQuery() function, the jQuery object constructor . In other words, it's a variable called $ that's been assigned a function called jQuery , as can been seen in

I am trying to put some asm code into a latex document, onfurtunatly pdflatex treats the $ signs within my document as math env (which I do not want). On the other side I'd still like to use that fancy linebreak arrow (which uses math env to display it). \lstset{ texcl=false, mathescape=false, .., prebreak = \raisebox{0ex}[0ex][0ex]{ensuremath{\hookleftarrow}} } example snap: CTRL_WD_12 equ $303400 CTRL_WD_34 equ $220000 CTRL_WD_56 equ $000000 CTRL_WD_78 equ $000000 thanks for any help. You have a missing backslash. Try: prebreak = \raisebox{0ex}[0ex][0ex]{\ensuremath{\hookleftarrow}} It was

I am reading the document of GNU Make. Here is an example %.d: %.c @set -e; rm -f $@; \ $(CC) -M $(CPPFLAGS) $< > $@.$$$$; \ sed ’s,\($*\)\.o[ :]*,\1.o $@ : ,g’ < $@.$$$$ > $@; \ rm -f $@.$$$$ I tried this on a C++ program, and got the list of files init3d.d init3d.d.18449 input.d input.d.18444 main.d main.d.18439 Here is what I found but don't understand in the same document If you have enabled secondary expansion and you want a literal dollar sign in the prerequisites list, you must actually write four dollar signs (‘$$$$’). I wonder what the four dollar signs "$$$$" mean actually? How do

I'm currently reading 'Javascript Web Applications' (O'Reilly, Alex MacCaw) and very early on there's a code snippet which might appear to execute a JS function, within an HTML document, yet it is not enclosed by <script> tags: // template.html <div> <script> function doSomething(aParam) { /* do stuff ... */ }; </script> ${ doSomething(this.someX) } </div> Please could someone kindly explain the dollar-sign-curly-brace notation ? I'm currently learning JS and I haven't seen this before, so I'm presuming it's either JS shorthand for code execution (if so, why no terminating semi-colon?), or