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

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GoErrors & validation

Parse an email address syntax

Parse an email address syntax using a complete Go program with explicit sample inputs.

Go✓ Tested
C#Types & reliable control flow

Parse an enum name without throwing

C#: Combine TryParse and IsDefined when only named declared values should be accepted.

C#✓ Tested
JavaNumbers & dates

Parse an integer safely

Handle invalid Java integer input with NumberFormatException.

Java✓ Tested
PythonStrings & dates

Parse and format a date

Convert a date string into a datetime object, then format it in a different, human-readable order.

date✓ Tested
RustIterators & transformations

Partition values into two collections

Partition values into two collections in a complete Rust program using the standard library.

Rust✓ Tested
C#Types & reliable control flow

Pass behavior as a function delegate

C#: Func describes a callable with typed parameters and a return value.

C#✓ Tested
C#Types & reliable control flow

Perform cleanup even after an exception

C#: A finally block runs after a handled failure as well as after success.

C#✓ Tested
GoSlices & collections

Preallocate a slice’s capacity

Preallocate a slice’s capacity using a complete Go program with explicit sample inputs.

Go✓ Tested
GitMerging & replaying changes

Preserve a feature branch boundary with a merge commit

Git: No-ff records a merge commit even when a fast-forward would be possible.

Git✓ Tested
GoJSON & encoding

Preserve a large JSON integer

Preserve a large JSON integer using a complete Go program with explicit sample inputs.

Go✓ Tested
GitRestoring & revising local work

Preview removal of an untracked scratch file

Git: The dry-run flag shows what clean would remove without deleting it.

Git✓ Tested
RustGetting Started

Print a collection for inspection

Print a collection for inspection in a complete Rust program using the standard library.

Rust✓ Tested