external variables

Li Hongqiang iOS Classic face question 30-a large-size face questionTo examine the basis of an interviewer, basically asking a @property is enough:What modifiers can be followed @property? Thread-Safe: Atomic,nonatomic

These days in the project will always use the block value and transmission method, today the block was organized.Block code blocks are primarily used for communication between objects (reverse passing values and method passing).First, let's take a

Scope (scoping)The JavaScript scope is confusing because its program syntax itself is long like the C-family language. My understanding of scopes is a closed space that only has an effect on a range and does not have an impact on the outside. In

vardb =(function () {//Create a hidden object, this object holds some data//This object cannot be accessed from outside.vardata = {};//Create a function that provides some way to access datareturnfunction (key, Val) {if(val = = = undefined)

In the C language, a function name can be passed to a parameter as a function pointer to implement a callbackvoid F1 () {printf ("F1 () \ n");} void F2 () {printf ("f2 () \ n");} void F3 () {printf ("f3 () \ n");} void do_func (void(*f) ()) {f ();}

Some summaries after online review, not originalIn general, we need to invoke a JavaScript function, the basic condition is defined first, and then called.If you do not need to display the calling function, so that the function is executed at the

Storage class:Storage Time link Memory managementFor a variable (a different storage type) it can be described by the storage period, the link property, and the corresponding scope.The storage period is the time the variable is held in memory, and

C++11 adds a lot of features, lambda expressions are one of them, if you want to understand the c++11 full features, it is recommended to go here, here, here, and see here. This article, as the last blog in May, will introduce the lambda expression

Here is a record of the previous learning a variety of books and articles inside the JS tips, share to everyone, but also for their own inspection, but also for those who found to create and share these skills of the predecessors and Daniel.1.

------- iOS Training look forward to communicating with you! ----------First, variablesA variable represents a named storage unit with a specific attribute, and the value of the variable can be changed during operation. variables must be defined

Lambda expression writing format in C + +[capture list] (params list) mutable exception-> return type { function body }The list of external variables, which is the list of capture list params list function parameters, mutable can be modified by

Scope chain :Each of the function functions of JavaScript has its own scope, which is saved using active object (AO) active objects, forming a scope chain in the nested functions.The scope chain is the AO chain from inside to outsideThe search for

When it comes to closures, it must have been heard, and my simple understanding follows.To tell the truth, there are not many scenes of actual manual closures in the work, but the third-party frameworks and components used in the project are more or

I believe you will often encounter the following two types of writing:(function() {...}) () and (function() {...} ())What does it mean to write like this? What difference does it have?Prior to this, we need to understand several

1 , a C-compiled program consumes memory in the following sections1. Stack (stack)-the program is automatically assigned by the compiler when it is run, storing the parameter value of the function, the value of the local variable, etc. It operates

Two of the most common immediate execution functions in JS (function () {...}) () (function () {...} ()) The difference between a function declaration and a function expression is that: The JavaScript engine will '

1,range for; altofor (const Auto& Agent:componentagents_){Agent->interface ();}See http://www.cnblogs.com/h46incon/archive/2013/06/02/3113737.htmlThe latest C + + standard updates the features of the Auto keywordIn addition to having the original

Brief introduction Awk is a powerful text analysis tool that is particularly powerful when it comes to analyzing and generating reports on data, compared to grep lookup and sed editing. To put it simply, awk reads the file line by row, using a

Full format control for printf:%-0 M.N L or H format charactersThe following is a description of the constituent format description:①%: Represents the starting symbol for the format description and is not missing.②-: Has-represents the left-aligned

JavaScript is quite casual compared to other programming languages, so the JavaScript code is full of all kinds of exotic work, and sometimes, of course, understanding the various types of writing is a further insight into JavaScript language