Found a total of 10000 related content
python if else in list comprehension
Article 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
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965
How to filter a List using Java 8 Stream API?
Article 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
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789
5 jQuery Touch Swipe Image Gallery Plugins
Article 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
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1021
Filtering Array Elements with the Javascript Filter Method
Article 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
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139
php regex negative lookahead example
Article 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
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344
Filtering an Array of Objects in JavaScript
Article Introduction：The filter() method in JavaScript is used to create a new array containing all the passing test elements. 1.filter() does not modify the original array, but returns a new array that meets the conditional elements; 2. The basic syntax is array.filter((element)=>{returncondition;}); 3. The object array can be filtered by attribute value, such as filtering users older than 30; 4. Support multi-condition filtering, such as meeting the age and name length conditions at the same time; 5. Can handle dynamic conditions and pass filter parameters into functions to achieve flexible filtering; 6. When using it, be careful to return boolean values ??to avoid returning empty arrays, and combine other methods to achieve complex logic such as string matching.
2025-07-12
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837
Mastering XPath for Complex XML Document Navigation
Article Introduction：Master the axis operations except / and //, such as parent::, following-sibling:: and preceding::, and use //node()[self::sectionorself::chapter] to match multiple tags; 2. Use predicates to perform complex filtering, such as position, multi-condition combination and function judgment, for example //log[substring(@timestamp,1,10)='2024-05-20'] to filter by date; 3. Correctly handle the namespace, you need to register the prefix and URI mapping in the parser, such as //ns:item, you need to configure ns→http://example.com/ns
2025-07-23
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170
excel index match for multiple criteria
Article Introduction：Multi-condition search is implemented using INDEX and MATCH in Excel, which can be done through array formulas or auxiliary columns. 1. Use array formula: =INDEX(C:C,MATCH(1,(A:A="Zhang San")*(B:B="Sales Department"),0)), which is suitable for direct input of new Excel or Ctrl Shift Enter to confirm with the old version; 2. Use auxiliary columns: After splicing the contents of column A and B in column D, use =INDEX(C:C,MATCH("Zhang San Sales Department", D:D,0)) to find; 3. Return multiple results to use FILTER function; 4. Be careful to avoid references from the entire column.
2025-07-12
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930
Filtering aggregated results using the SQL HAVING clause.
Article Introduction：HAVING is a clause in SQL used to filter aggregate results. Unlike WHERE, it acts on the grouped data after GROUPBY. 1.HAVING appears after GROUPBY and is used to filter the results after aggregation, supporting aggregation functions such as AVG, COUNT, SUM, etc.; 2. Expressions or alias can be used (depending on the database support), but non-aggregation fields are not recommended; 3. Common scenarios include filtering a specific number of groups (such as customers with orders exceeding 10 orders), and cooperating with COUNT for record filtering (such as users who log in at least twice); 4. Supporting multi-condition combination filtering, for example, meeting the average salary is greater than 5,000 and the number of people exceeds 20; 5. The difference from WHERE is that WHERE
2025-07-10
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905
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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829
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1455
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1062
