literals

Exact meaning of Function literal in JavaScript

由 北城余情 提交于 2019-12-04 17:56:09
问题 In JavaScript there are both Object literals and function literals. Object literal: myObject = {myprop:"myValue"} Function literal: myFunction = function() { alert("hello world"); } What is the significance of the word literal? Can we say Java has method literals? public void myMethod() { System.out.println("are my literal"); } 回答1: A function literal is just an expression that defines an unnamed function. The syntax for a function literal is much like that of the function statement, except

Possible to convert list of #defines into strings

由 与世无争的帅哥 提交于 2019-12-04 09:19:38
问题 Suppose I have a list of #define s in a header file for an external library. These #define s represent error codes returned from functions. I want to write a conversion function that can take as an input an error code and return as an output a string literal representing the actual #define name. As an example, if I have #define NO_ERROR 0 #define ONE_KIND_OF_ERROR 1 #define ANOTHER_KIND_OF_ERROR 2 I would like a function to be able to called like int errorCode = doSomeLibraryFunction(); if

JavaScript: JSLint throws "Read Only

由 北战南征 提交于 2019-12-04 08:55:08
问题 My code: note: the Slider Object is declared but omitted in the snippet below for better readability "use strict"; /*global arrayContainer, SliderInstance, DomObjects */ arrayContainer = new Slider.constructArray(); SliderInstance = Object.beget(Slider); DomObjects = { animationContainer: document.getElementById('animationContainer'), buttonRight: document.getElementById('buttonRight'), buttonRightDots: document.getElementById('buttonRightDots'), ieEffectImg: document.getElementById('ie

How to declare an array inline in VB.NET

由 烂漫一生 提交于 2019-12-04 08:47:45
问题 I am looking for the VB.NET equivalent of var strings = new string[] {"abc", "def", "ghi"}; 回答1: Dim strings() As String = {"abc", "def", "ghi"} 回答2: There are plenty of correct answers to this already now, but here's a "teach a guy to fish" version. First create a tiny console app in C#: class Test { static void Main() { var strings = new string[] {"abc", "def", "ghi"}; } } Compile it, keeping debug information: csc /debug+ Test.cs Run Reflector on it, and open up the Main method - then

How do you declare a Char literal in Visual Basic .NET?

由 谁都会走 提交于 2019-12-04 08:47:12
问题 With Option Strict On : Dim theLetterA As Char = "A" returns an error about converting the string "A" to a Char . What is the syntax to enter a Char literal? 回答1: A character literal is entered using a single character string suffixed with a C . Dim theLetterA As Char = "A"C 回答2: I would use CChar. E.g.: Dim theLetterA As Char = CChar("A") Check the MSDN website https://msdn.microsoft.com/en-us/library/s2dy91zy.aspx for details on CChar. 回答3: In the case of trying to get a double quote as a

javascript object literal - nested functions and the “this” keyword

由 自作多情 提交于 2019-12-04 08:45:28
问题 In the example below, when functionA() is invoked, the this keyword refers to the containing object, so I can access its properties (e.g. theValue ) My question: How do I refer to properties of myObj from within the nested functionB() ? var myObj = { theValue: "The rain in Spain", functionA: function() { alert(this.theValue); }, moreFunctions: { functionB: function() { alert(????.theValue); } } } myObj.functionA(); myObj.moreFunctions.functionB(); Thanks in advance. 回答1: Immediate invocation

Strange cross-threading UI errors

由 好久不见. 提交于 2019-12-04 06:33:40
I'm writing a WinForms app which has two modes: console or GUI. Three projects within the same solution, one for the console app, one for the UI forms and the third to hold the logic that the two interfaces will both connect too. The Console app runs absolutely smoothly. A model which holds the user-selections, it has an IList<T> where T is a local object, Step , which implements INotifyPropertyChanged , so in the UI this is mounted on to a DataGridView. All is fine at runtime, the initial state of the objects is reflected on the screen. Each of the Step objects is a task which is performed in

Why is arbitrary precision in double literals allowed in Java?

由 人走茶凉 提交于 2019-12-04 06:09:23
I just learned from Peter Lawreys post that this is valid expression, and evaluates to true . 333333333333333.33d == 333333333333333.3d My question is, why is it allowed to have double literals which can't be represented in a double, while integer literals that can't be represented are disallowed. What is the rationale for this decision. A side note, I can actually trigger out of range compile error for doubles literals :-)

Max length of a string literal?

由 这一生的挚爱 提交于 2019-12-04 05:32:14
I am trying to create a long string literal, which I store inside a std::string. If I create a literal up to approximately 2600 characters, everything prints fine. If I go beyond that number of symbols, I only get some random garbage characters printed. I have been using the C standard as guidance, environmental limits are specified as "4095 characters in a string literal (after concatenation)". But the code is written in C++. So my question is, what is the minimum amount of characters in a C++ string literal? (The problem might possibly be elsewhere in the code, but I would like to ensure

Set Current Date at default value in a data set?

由 雨燕双飞 提交于 2019-12-04 05:24:58
问题 I have a dataset that i am trying to set the default value as the current date and time. I believe that value needs to be a literal. Is there a certain way to do this? Because I am not able to do this using System.DateTime it seems.Any advice would be a great deal of help. 回答1: You can set the default value of relevant column as dataTable1.Columns["dateTimeColumn"].DefaultValue = System.DateTime.Now; If you fetch data from a SQL Server database, then you can set the default value using the
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