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grouping

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FunTester
FunTester
Sep 5, 2024 · Backend Development

Practical Java Streams Techniques: Filtering, Mapping, Reducing, and Grouping

This article introduces five practical Java Streams techniques—including precise filtering, map transformation, aggregation with reduce, and advanced grouping—to help developers write clearer, more efficient backend code, complete with code examples and explanations of each operation.

FilterJavabackend
0 likes · 8 min read
Practical Java Streams Techniques: Filtering, Mapping, Reducing, and Grouping
Laravel Tech Community
Laravel Tech Community
Sep 27, 2023 · Backend Development

Counting Items with Identical Fields in a Two‑Dimensional PHP Array

This article demonstrates two PHP approaches—manual looping and functional array utilities—to group and count records in a two‑dimensional array based on identical name and age fields, showing the full source code and expected output.

Data ProcessingPHParray
0 likes · 4 min read
Counting Items with Identical Fields in a Two‑Dimensional PHP Array
Sohu Tech Products
Sohu Tech Products
Sep 28, 2022 · Fundamentals

New ECMAScript 2023 Array Proposals: Non‑Destructive Methods, Grouping, Find‑From‑Last, and fromAsync

The article explains the upcoming ECMAScript 2023 proposals—including non‑destructive array methods (toReversed, toSorted, toSpliced, with), array grouping (group, groupToMap), reverse‑search methods (findLast, findLastIndex), and the asynchronous constructor Array.fromAsync—detailing their stages, usage examples, polyfills, and type signatures for modern JavaScript development.

Array MethodsECMAScriptJavaScript proposals
0 likes · 14 min read
New ECMAScript 2023 Array Proposals: Non‑Destructive Methods, Grouping, Find‑From‑Last, and fromAsync
Python Programming Learning Circle
Python Programming Learning Circle
Aug 31, 2022 · Fundamentals

Pandas Data Manipulation: Sorting, Selecting, Grouping, and Reshaping Techniques

This article provides a comprehensive, visual guide to essential Pandas operations—including sorting, column selection, grouping, multi‑aggregation, filtering, dropping, joining, merging, pivot tables, melting, stacking, unstacking, and index manipulation—illustrated with clear code examples for data analysis in Python.

Reshapingdata analysisdata-manipulation
0 likes · 4 min read
Pandas Data Manipulation: Sorting, Selecting, Grouping, and Reshaping Techniques
Python Programming Learning Circle
Python Programming Learning Circle
Jun 5, 2022 · Fundamentals

Pandas Data Manipulation: Sorting, Selecting, Grouping, and Reshaping

This article provides a visual guide to using Pandas for data manipulation, covering sorting with sort_values, column selection, grouping with groupby and various aggregations, filtering rows and columns, dropping, joining, merging, pivot tables, melting, stacking, unstacking, and index operations, illustrated with code snippets and screenshots.

data analysisdata-manipulationdataframe
0 likes · 5 min read
Pandas Data Manipulation: Sorting, Selecting, Grouping, and Reshaping
Zhuanzhuan Tech
Zhuanzhuan Tech
May 11, 2022 · Backend Development

Evolution of Grouped Concurrency Scheduling and the Self‑Driven Concurrency Model for E‑commerce Backend Services

This article analyzes the challenges of aggregating multiple RPC calls in e‑commerce app backends, explains simple and complex concurrency scenarios, introduces grouped concurrency scheduling, and presents a self‑driven concurrency model that automates dependency handling to improve response latency and maintainability.

Optimizationbackendconcurrency
0 likes · 10 min read
Evolution of Grouped Concurrency Scheduling and the Self‑Driven Concurrency Model for E‑commerce Backend Services
Python Programming Learning Circle
Python Programming Learning Circle
Apr 6, 2021 · Fundamentals

Advanced Pandas Tutorial: Data Access, Indexing, Merging, Grouping, and Time Handling

This article extends a basic pandas tutorial by covering advanced data access methods, index types, concatenation, merging, joining, grouping, aggregation, time series handling, and basic plotting, providing clear code examples and explanations for each feature.

Indexingdata-manipulationgrouping
0 likes · 20 min read
Advanced Pandas Tutorial: Data Access, Indexing, Merging, Grouping, and Time Handling
Aikesheng Open Source Community
Aikesheng Open Source Community
Aug 10, 2020 · Databases

Using MySQL 8.0 GROUPING() Function with GROUP BY WITH ROLLUP

This article explains MySQL 8.0's new GROUPING() function, demonstrates how it works with GROUP BY ... WITH ROLLUP to differentiate regular NULL values from roll‑up summary rows, and provides multiple SQL examples and usage tips.

DatabaseFunctionsMySQL
0 likes · 12 min read
Using MySQL 8.0 GROUPING() Function with GROUP BY WITH ROLLUP
Python Programming Learning Circle
Python Programming Learning Circle
Apr 6, 2020 · Fundamentals

Using Regular Expressions in Python: Raw Strings, match, search, findall, and Grouping

This article explains how Python's re module works, covering raw string literals, the differences between match, search, and findall methods, how to retrieve match positions, and how to use numbered and named groups for extracting sub‑patterns from text.

PythonRaw StringsSearch
0 likes · 7 min read
Using Regular Expressions in Python: Raw Strings, match, search, findall, and Grouping