Course Introduction：In Python, if-else can be used in conjunction with list comprehensions, but the syntax order is different from the usual ones. 1. When you need to return different values according to the condition, the structure is [expression_if_trueif conditionelseexpression_if_falseforiteminiterable], such as [xifx%2==0else0forxinnumbers]; 2. If you only need to filter elements, the structure is [expressionforiteminiterableifcondition], such as [xforxinnumsifx>0]; 3. For multi-condition cases, you can
2025-07-16 comment 0 965
Course Introduction：In Java 8, using the filter() method of StreamAPI combined with Lambda expressions can efficiently filter Lists. 1. Basic filtering: If you keep integers greater than 10, you need to use filter(n->n>10); 2. The filtering object list can be judged by object properties, such as filter(p->p.getAge()>30); 3. Multi-condition filtering can be implemented using logical operations combinations or chain calls; 4. The results can be further processed in combination with map() or limit(), such as extracting attributes or limiting the number.
2025-07-23 comment 0 807
Course Introduction：Five super cool jQuery touch sliding picture library plug-ins are recommended to help you display your products or portfolios in a wonderful way! Users can swipe up and down, left and right to switch pictures, which is worth a try! Related articles: 30 Best Free Android Media Players Add jQuery drag/touch support for iPad Hammer.js touch carousel diagram A JavaScript library for multi-touch gestures. Source code demonstration 2. TouchSwipe TouchSwipe is a jQuery plug-in that can be used with jQuery on touch devices such as iPad and iPhone. Source code demonstration 3. TouchWipe Allows you to use iPhone, iPad or i
2025-02-23 comment 0 1021
Course Introduction：JavaScript's filter method is used to create a new array containing all elements tested by the callback function. 1. Basic usage: filter traverses each element of the array. If the callback returns true, the element will be retained, such as filtering numbers greater than 25; 2. Filtering object array: You can filter through object properties, such as selecting users with age greater than or equal to 18; 3. Multi-condition filtering: You can use logical operators to combine multiple conditions in the callback, such as meeting age greater than 20 and the name contains the letter "a"; 4. Dynamic filtering: Combining the input box to realize the real-time search function, dynamically update the filter results based on user input, ensuring that upper and lower case insensitive.
2025-07-08 comment 0 141
Course Introduction：Negative first is used in PHP regulars to match positions that do not follow specific content. ^(?!.\.jpg$).*$/ can filter non-.jpg-end file names, such as photo.png?; ^(?!.error). $/m can exclude log lines containing "error"; combined use such as ^a(?!.*b).*$/ can match strings starting with a and not containing b; common misunderstandings include missing writes.*, missing anchor points, and wrong order of multi-condition overlay. Correct combination of anchor points and wildcard characters is the key.
2025-07-07 comment 0 347
Course Elementary 13795
Course Introduction：Scala Tutorial Scala is a multi-paradigm programming language, designed to integrate various features of object-oriented programming and functional programming.
Course Elementary 82321
Course Introduction："CSS Online Manual" is the official CSS online reference manual. This CSS online development manual contains various CSS properties, definitions, usage methods, example operations, etc. It is an indispensable online query manual for WEB programming learners and developers! CSS: Cascading Style Sheets (English full name: Cascading Style Sheets) is an application used to express HTML (Standard Universal Markup Language).
Course Elementary 13157
Course Introduction：SVG is a markup language for vector graphics in HTML5. It maintains powerful drawing capabilities and at the same time has a very high-end interface to operate graphics by directly operating Dom nodes. This "SVG Tutorial" is intended to allow students to master the SVG language and some of its corresponding APIs, combined with the knowledge of 2D drawing, so that students can render and control complex graphics on the page.
Course Elementary 24604
Course Introduction：In the "AngularJS Chinese Reference Manual", AngularJS extends HTML with new attributes and expressions. AngularJS can build a single page application (SPAs: Single Page Applications). AngularJS is very easy to learn.
Course Elementary 27464
Course Introduction：Go is a new language, a concurrent, garbage-collected, fast-compiled language. It can compile a large Go program in a few seconds on a single computer. Go provides a model for software construction that makes dependency analysis easier and avoids most C-style include files and library headers. Go is a statically typed language, and its type system has no hierarchy. Therefore users do not need to spend time defining relationships between types, which feels more lightweight than typical object-oriented languages. Go is a completely garbage-collected language and provides basic support for concurrent execution and communication. By its design, Go is intended to provide a method for constructing system software on multi-core machines.
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