Tag:function

  • JS function

    Time:2021-3-4

    1. Ordinary function Grammar: Function function name (){ Statement block } 2. Functions with parameters Grammar: Function function name (parameter list){ Statement block } 3. Function with return value Grammar: Function function name (parameter list){ Statement block; Return value; } Allow a variable to accept the return value after calling the function Var variable name […]

  • List is not in group by clause and contains nonaggre

    Time:2021-3-4

    Causes of the problem: MySQL 5.7.5 and above functions rely on the detection function. If only is enabled_ FULL_ GROUP_ By SQL mode (by default), MySQL will reject queries that select lists, having conditions, or order by lists, refer to non collection columns that are neither named nor functionally dependent on them in the group […]

  • Realization of function compose and Coriolis

    Time:2021-3-4

    Function Coriolis Sometimes there is a need like this add(5)(2)(3)=10add(2,5)(3)=10add(1)(7,2)=10 add(1)(8)(1)()=10add(7,1)(1)(1)()=10add(4)(2,1)(1)(2)()=10 Two ways of writing by Ke Lihua 1、 If the number of parameters passed in satisfies the number of parameters to be executed, the function will be executed function curry_(fn) { //Returns a new function judge with the receive parameter… Args return function judge(…arg) […]

  • Django 1.8 official document translation: 14-6 system checking framework

    Time:2021-3-4

    System inspection framework New in Django 1.7\. The system inspection framework is designed to verify a series of static inspections of the Django project. It can detect common problems and provide tips on how to fix them. The framework can be extended so you can easily add your own checks. The inspection can be carried […]

  • Python decorator implements dynamic type checking of functions

    Time:2021-3-4

    Decorator code for function dynamic type checking import inspect import functools def typeHints(fn): @functools.wraps(fn) def wrap(*args, **kwargs): sig = inspect.signature(fn) params = sig.parameters #Processing kwargs: Dictionary for k, v in kwargs: param = params[k] if param.annotation != inspect._empty and not isinstance(v, param.annotation): raise TypeError(‘parameter {} requires {}, but got {}’.format(k, param.annotation, type(v))) #Processing args: tuple […]

  • Lesson 5 vuex after reading this, you will

    Time:2021-3-3

    Like Vue router, vuex is the core plug-in of Vue. It is the state management of Vue. For the value transfer between cross components, these values can be put into the state state for management 1. State usage In Lecture 2, I have modified the Src / store folder. Here, I will start with Src […]

  • front end mobileWindow.js The 0.0.1 version of the framework was officially released, and its shortcomings are expected to be pointed out

    Time:2021-3-3

    mobileWindow.js Because the company’s new project needs to achieve similar app operation in the mobile terminal, in order to quickly develop, of course, we hope to find a ready-made third-party class library to realize the relevant functions, but after a few days, we still haven’t found a particularly suitable one, so we started to write […]

  • Can const member functions take non const pointers as return values?

    Time:2021-3-3

    Let’s start with a piece of code class A { int *x; public: int *f() const { return x; } }; Member functionfReturn to private memberxI think it will modify the membersx, right? fyesconstMember function, I should add it before the return typeconstIs that right? constThe member function should guarantee that it cannot change any […]

  • Is JavaScript simple? Do you really understand foreach right?

    Time:2021-3-3

      you understandArray.prototype.forEachReally, right? Array.prototype.forEach    we all know,forEach()Method executes the given function once for each element of the array. Its syntax is also very simplearr.forEach(callback(currentValue [, index [, array]])[, thisArg]): Callback: function executed for each element in the array, which takes one to three arguments: Currentvalue: the current element being processed in the array. […]

  • PHP interview is often asked to summarize the knowledge points, very useful for you

    Time:2021-3-3

    Article from:mp.weixin.qq.com/s/Fq7LByOiUXg0Z7Q…Learning materials sharing:【Videos, documents, interview questions】   These are the knowledge points often asked in PHP interview. Only pointed out that the knowledge points, the corresponding also need to find their own information system learning. I hope you can not only understand what it is, but also understand why and the principle behind it. If […]

  • Big data development hive common date function

    Time:2021-3-3

    The front is a summary of commonly used date functions, and the back is a continuous date SQL topic and its solution routine. 1. Current date and time select current_timestamp — 2020-12-05 19:16:29.284 2. Get the current date, which is 2020-12-05 SELECT current_date; ## OR SELECT current_date(); — 2020-12-05 3. Get the time stamp of […]

  • Encapsulating unified request function in uni app (Reprint)

    Time:2021-3-3

    Encapsulating the unified request function is beneficial to project maintenance The overall function is simple and practical, but Xiaobian encountered a huge pit. In the project, the jump method is used in the Vue file. After entering the URL parameter ‘/’, the path of the tool prompt is’ / pages / login / Login ‘, […]