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

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Docker / ComposeExecution & file transfer

Supply an environment variable to an exec process

Docker / Compose: An exec environment override applies to the new process only.

Docker / Compose✓ Tested
CDynamic memory & ownership

Swap owned buffers by swapping their pointers

C: Pointer swaps avoid copying the underlying data.

C✓ Tested
GitGetting Started

Switch to a newly created branch

Git: Switch to a newly created branch inside the disposable repository created by the input setup.

Git✓ Tested
GitBranches & ancestry

Test whether one revision is an ancestor of another

Git: merge-base --is-ancestor reports its answer through the exit status.

Git✓ Tested
GitInspecting the working tree

Test whether tracked working files changed

Git: A quiet diff returns status one for differences, so handle it in a conditional.

Git✓ Tested
Arduino / CBinary values & packets

Toggle a bit with an XOR mask

Arduino / C: XOR flips selected bits and leaves all other bits unchanged.

Arduino / C✓ Tested
jQueryGetting Started

Toggle a CSS class with a click

jQuery: Learn how to toggle a CSS class with a click in a complete browser example.

jQuery✓ Tested
HTMLNative disclosure & dialogs

Toggle a native popover from a button

HTML: The popovertarget relationship handles show and hide behavior without a click handler.

HTML✓ Tested
jQueryDOM & classes

Toggle a state class

Toggle a CSS class in a jQuery click handler.

jQuery✓ Tested
Arduino / CDigital signals & interrupts

Toggle an output using an explicit software state

Arduino / C: Keep the intended output state in a Boolean variable.

Arduino / C✓ Tested
jQueryCollections & styling

Transform a collection into a plain array

jQuery: map followed by get returns ordinary JavaScript values.

jQuery✓ Tested
jQueryDeferred work & queues

Transform a deferred value with then

jQuery: then returns a new promise with the callback’s result.

jQuery✓ Tested