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Small, practical examples. Search by task or narrow things down below.

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PostgresConstraints & defaults

Block deletion of a referenced parent

Postgres: The default foreign-key action prevents deletion while a child still refers to the parent.

Postgres✓ Tested
SQLiteConstraints & defaults

Block deletion of a referenced parent

SQLite: The default foreign-key action prevents deletion while a child still refers to the parent.

SQLite✓ Tested
HTMLImages & embedded documents

Block scripts in an embedded document

HTML: An empty sandbox attribute applies the default set of restrictions, including blocking script execution.

HTML✓ Tested
RustThreads & shared ownership

Borrow local data in a scoped thread

Borrow local data in a scoped thread in a complete Rust program using the standard library.

Rust✓ Tested
RustTesting & reusable patterns

Borrow text until a modification is needed

Borrow text until a modification is needed in a complete Rust program using the standard library.

Rust✓ Tested
RustGetting Started

Borrow text without transferring ownership

Borrow text without transferring ownership in a complete Rust program using the standard library.

Rust✓ Tested
Linux CommandsDates & process utilities

Bound a command execution time

Linux Commands: Use timeout and handle status 124 as an expected time limit.

Linux Commands✓ Tested
Linux CommandsGetting Started

Branch on a command’s exit status

Linux Commands: Branch on a command’s exit status using GNU/Linux commands in an empty practice directory.

Linux Commands✓ Tested
Arduino / CGetting Started

Branch on a threshold

Arduino / C: Branch on a threshold on an Uno with the Serial Monitor set to 9600 baud.

Arduino / C✓ Tested
Linux CommandsSearching text

Branch on whether a pattern exists

Linux Commands: Use grep -q in a conditional so an ordinary no-match result is not an unhandled failure.

Linux Commands✓ Tested
HTMLGetting Started

Build a first radio-button group

HTML: Learn how to build a first radio-button group in a complete browser example.

HTML✓ Tested
C++Containers & compound values

Build a minimum-priority queue

C++: Supply greater as the comparator because priority_queue defaults to the largest value first.

C++✓ Tested