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

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Bash ScriptsFunction scope & composition

Keep a function variable local

Bash Scripts: Local prevents an ordinary function assignment from replacing a caller variable.

Bash Scripts✓ Tested
ReactRefs & DOM interaction

Keep a mutable value without rendering on each write

Keep a mutable value without rendering on each write with a small React component and explicit browser behavior.

React✓ Tested
Arduino / CText & bounded buffers

Keep a serial message in flash memory

Arduino / C: The F macro keeps a literal out of scarce SRAM.

Arduino / C✓ Tested
Arduino / CGetting Started

Keep a value inside an allowed range

Arduino / C: Keep a value inside an allowed range on an Uno with the Serial Monitor set to 9600 baud.

Arduino / C✓ Tested
HTMLImages & embedded documents

Keep an image and its visible caption together

HTML: Figure and figcaption represent a self-contained illustration with an associated caption.

HTML✓ Tested
RustErrors & optional values

Keep an optional value only when valid

Keep an optional value only when valid in a complete Rust program using the standard library.

Rust✓ Tested
Arduino / CGetting Started

Keep fixed text in flash memory

Arduino / C: Keep fixed text in flash memory on an Uno with the Serial Monitor set to 9600 baud.

Arduino / C✓ Tested
Linux CommandsGetting Started

Keep spaces inside one argument

Linux Commands: Keep spaces inside one argument using GNU/Linux commands in an empty practice directory.

Linux Commands✓ Tested
SQLExpressions & aggregates

Label rows with CASE

Derive a readable label from a condition.

CASE✓ Tested
GitGetting Started

Label the current commit with a tag

Git: Label the current commit with a tag inside the disposable repository created by the input setup.

Git✓ Tested
Bash ScriptsGetting Started

Limit a beginner function variable to local scope

Bash Scripts: Limit a beginner function variable to local scope with a small standalone Bash program.

Bash Scripts✓ Tested
HTMLInput constraints

Limit a numeric input to an inclusive range

HTML: Number inputs expose range validation separately from the entered text.

HTML✓ Tested