Operations

File and Folder Operations

Learn how to navigate, create, and remove directories and inspect file attributes using core Windows Batch commands.

Set Operations: Union, Intersect, Except

Learn how LINQ's set operators — Union, Intersect, Except, and Distinct — deduplicate and compare sequences using equality semantics.

HDFS Commands

The essential hdfs dfs and hdfs dfsadmin commands for navigating, managing, and administering data in HDFS from the command line.

Working with Data Operations

How Compose, Parse JSON, Select, Filter Array, and table actions reshape data inside a flow without external calls.

Array Operations and Slicing

Whole-array arithmetic, array sections, and the WHERE/FORALL constructs that let Fortran express vectorized operations without explicit loops.

Sets in Pascal

Explore Pascal's native set type — union, intersection, difference, and membership testing over ordinal values.

Matrix Operations and Linear Algebra

Understand the distinction between matrix and element-wise operators, solve linear systems with backslash, and compute determinants, inverses, and eigenvalues.

Vectorized Operations in R

How R applies operations across entire vectors at once, including the recycling rule, logical indexing, and why vectorized code outperforms loops.

Your First R Script

How to write, structure, and run a complete R script covering variables, a custom function, control flow, and output, both inside RStudio and from the command…

Visitor Pattern

A behavioral pattern that lets you add new operations to a family of classes without modifying those classes, by moving the operation into a separate visitor o…

The Elasticsearch REST API

How to interact with Elasticsearch over HTTP: indexing, retrieving, searching, and managing documents and indices via the REST API.

Strings in Redis

Learn how the Redis String type works as a binary-safe byte sequence, covering SET/GET semantics, atomic counters, expiration, and bit-level operations.

Collection Operations in Kotlin (map, filter, fold)

How to transform, filter, and reduce Kotlin collections using functional-style operations like map, filter, and fold.

Collection Operations in Swift (map, filter, reduce)

Master Swift's functional-style collection operations — map, filter, reduce, compactMap, and sorted.

CRUD Operations in Express

Build complete Create, Read, Update, and Delete route handlers in Express using a database model.

Linked List Operations and Problems

Classic linked list algorithms including reversal, cycle detection with Floyd's algorithm, and finding the middle node.

CROSS JOIN and Set Operations

Produce a Cartesian product with CROSS JOIN, and combine query results with UNION, UNION ALL, INTERSECT, and EXCEPT.

Vectorized Operations and Broadcasting

Vectorization applies operations across whole arrays without explicit loops, and broadcasting extends this to arrays of different but compatible shapes.