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The article was forwarded from the professional Laravel developer community with the original link: https://learnku.com/laravel/t... In Laravel, there is a very useful class called a collection of operand arrays.Believe that every Laravel developer has used collections more or less, especially when working with Eloquent.In this article, I wil ...

The initial learning of C++ includes the following aspects 1.C++ keywords We know that there are 32 keywords in C and 63 in c++.They are 2. Namespaces Why is there a namespace and what does it do?In a large project, there are many variables and functions to be defined. If these variables and functions are defined in the global scope, they may ...

For students who start learning C language programming or C++ process-oriented programming, it is good to use online OJ website for practice training to improve their programming ability.There are many OJ websites at home and abroad. It is unrealistic and unnecessary to go and see each one and brush a topic.Even with an OJ website, it's difficu ...

Article directory Explanation of 0 Sorting Algorithms 0.1 Internal and External Sorting 0.2 Comparisons and Non-Comparisons 0.3 On Time Complexity 0.4 On Stability 0.5 NOUN explanation: 1 Exchange Sort 1.1 When is the fastest 1.2 When is the sl ...

Original Link: https://my.oschina.net/u/2325575/blog/543731 In this chapter we will discuss generics and containers, which are precisely the generic requirements that arise from the re ...

Original Link: https://my.oschina.net/wuhaoyu/blog/607825 You know how to make filters This question and answer The highest ticket in the list was given to a more professional answer ...

Original Link: https://my.oschina.net/u/2610176/blog/600950 ArrayList actually supports adding, deleting, modifying, querying arrays of elements and providing some methods that we are ...

Operator Arithmetic operator operator describe Example + plus a + b - reduce a - b * ride a * b / except a / b % Remainder a % b // To be divisible by a // b ** exponentiation a ** b 2**3=8 Comparison operator Assuming variables a = 10, b = 20 operator describe Example == Equivalent or not. A = B returns False != Not ...

logging module logging module is a large module. It has a complete log system.Mainly divided into: main Logger - processor - formatterlogging is a python built-in module that does not require installation. Import mode: import logging is enough Log ranking (weak - > strong) DEBUG < INFO < WARNING < ERROR < FATAL DEBUG : Some in ...

LinkedHashMap is a subclass of HashMap, so it also has many features of HashMap. The difference is that LinkedHashMap also maintains a two-way linked list to ensure that the traversal order through Iterator is consistent with the insertion order. In addition, it supports Access Order, which is sorted according to the order in which the elements ...