nested-function | 易学教程

Returning from a nested function in javascript

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问题 I'm trying to make a function that uses jquery's ajaxfunction to get some info from my ajax.php file. code: function ajaxIt(dataLine){ $.ajax({ type: "POST", url: "ajax.php", data: "ajax=true&"+dataLine, success: function(msg){ console.log("[AjaxIt]: "+dataLine+" returned "+msg); return msg; } }); } if(ajaxIt("action=loggedIn")=="1"){ console.log("Logged In"); loggedIn=true; initiate2(); } The problem is that I can't get the success function to return all the way to the ajaxIt function. Could

Simulating nested functions in C++

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问题 In C the following code works in gcc. int foo( int foo_var ) { /*code*/ int bar( int bar_var ) { /*code*/ return bar_var; } return bar(foo_var); } How can I achieve the same functionality of nested functions in C++ with the gcc compiler? Don't mind if this seems like a beginner question. I am new to this site. 回答1: Turn your function into a functor as Herb Sutter suggests in this article 回答2: Local functions are not allowed in C++, but local classes are and function are allowed in local

Are multiple functions in one .m file nested or local when “end” isn't used

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问题 In MATLAB you can have multiple functions in one .m file. There is of course the main function, and then either nested or local functions. Examples of each function type: % myfunc.m with local function ------------------------------------------ function myfunc() disp(mylocalfunc()); end function output = mylocalfunc() % local function, no visibility of variables local to myfunc() output = 'hello world'; end % ----------------------------------------------------------------------- % myfunc.m

need help with nested jquery function

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问题 Please find my code below. My problem is that I the inner jQuery.get() doesn't get executed. Could some one help me out with this? jQuery(document).ready(function() { $('.error').hide(); $(".button").click(function() { // validate and process form here $('.error').hide(); var zipCode = $("input#name").val(); if (zipCode == "") { $("label#name_error").show(); $("input#name").focus(); return false; } var key = 'ac9c073a8e025308101307'; var noOfDays = 5; var url = 'http://www.worldweatheronline

call SQL function within R function

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问题 I am wondering if it is possible to call an SQL function within an R function? Say for example that I have this dummy data and SQL function written in Postgres 9.3 CREATE TABLE tbl ( id VARCHAR(2) PRIMARY KEY ,name TEXT ,year_born NUMERIC ,nationality TEXT ); INSERT INTO tbl(id, name, year_born, nationality) VALUES ('A1','Bill',2001,'American') ,('B1','Anna',1997,'Swedish') ,('A2','Bill',1991,'American') ,('B2','Anna',2004,'Swedish') ,('B3','Anna',1989,'Swedish') ,('A3','Bill',1995,'American'

Are nested functions possible in VBA?

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I'm trying to clean up code by stripping parameters from a function within a private scope, like this: Function complicatedFunction(x as Double, param1 as Double, param2 as Double) ... End Function Function mainActionHappensHere(L as Double, U as Double ...) Function cleaner(x) cleaner = complicatedFunction(x, L, U) End Function ... cleaner(x) 'Many calls to this function ... End Function Is this possible? Compiler complains, "Expected End Function", since I'm beginning a function before ending the outer one. And Google is no help :( PS I can't define cleaner() outside of mainActionHappensHere

call SQL function within R function

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I am wondering if it is possible to call an SQL function within an R function? Say for example that I have this dummy data and SQL function written in Postgres 9.3 CREATE TABLE tbl ( id VARCHAR(2) PRIMARY KEY ,name TEXT ,year_born NUMERIC ,nationality TEXT ); INSERT INTO tbl(id, name, year_born, nationality) VALUES ('A1','Bill',2001,'American') ,('B1','Anna',1997,'Swedish') ,('A2','Bill',1991,'American') ,('B2','Anna',2004,'Swedish') ,('B3','Anna',1989,'Swedish') ,('A3','Bill',1995,'American'); CREATE FUNCTION retrieve_data(TEXT) RETURNS TABLE ( id VARCHAR(2), name TEXT, year_born NUMERIC,

How can I combine multiple nested Substitute functions in Excel?

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问题 I am trying to set up a function to reformat a string that will later be concatenated. An example string would look like this: Standard_H2_W1_Launch_123x456_S_40K_AB Though sometimes the " S " doesn't exist, and sometimes the "40K" is "60K" or not there, and the "_AB" can also be "_CD" or _"EF". Finally, all underscores need to be changed to hyphens. The final product should look like this: Standard-H2-W1-Launch-123x456- I have four functions that if ran one after the other will take care of

Is self captured within a nested function

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With closures I usually append [weak self] onto my capture list and then do a null check on self: func myInstanceMethod() { let myClosure = { [weak self] (result : Bool) in if let this = self { this.anotherInstanceMethod() } } functionExpectingClosure(myClosure) } How do I perform the null check on self if I'm using a nested function in lieu of a closure (or is the check even necessary...or is it even good practice to use a nested function like this) i.e. func myInstanceMethod() { func nestedFunction(result : Bool) { anotherInstanceMethod() } functionExpectingClosure(nestedFunction) } rintaro

How can I combine multiple nested Substitute functions in Excel?

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I am trying to set up a function to reformat a string that will later be concatenated. An example string would look like this: Standard_H2_W1_Launch_123x456_S_40K_AB Though sometimes the " S " doesn't exist, and sometimes the "40K" is "60K" or not there, and the "_AB" can also be "_CD" or _"EF". Finally, all underscores need to be changed to hyphens. The final product should look like this: Standard-H2-W1-Launch-123x456- I have four functions that if ran one after the other will take care of all of this: =SUBSTITUTE(SUBSTITUTE(SUBSTITUTE(A2,"_AB","_"),"_CD","_"),"_EF","_") =SUBSTITUTE