Swift code examples
Every example includes an explanation and a link to open its source in the playground.
26 recipes
Compare two dates
Compare moments in time, or compare just the calendar day.
Read recipe →FilesList directory contents
Read the immediate children of a directory.
Read recipe →FilesGet the current directory
Find the working directory of the running process.
Read recipe →CollectionsCheck whether a value is an array
Inspect an unknown value and access its elements safely.
Read recipe →CollectionsRemove duplicates from an array
Keep the first occurrence in the original order.
Read recipe →JSONDecode JSON into a Swift type
Replace untyped dictionaries with a Decodable model.
Read recipe →JSONEncode a model as JSON
Serialize a model with stable, readable formatting.
Read recipe →CollectionsSort an array of records
Sort by a property without changing the original array.
Read recipe →BasicsUnwrap an optional safely
Handle a missing value without force-unwrapping.
Read recipe →DatesFormat a date
Use an explicit locale and time zone for a fixed format.
Read recipe →DatesParse an ISO 8601 date
Turn an internet timestamp into a Date.
Read recipe →DatesAdd calendar days to a date
Account for calendar and daylight-saving changes.
Read recipe →CollectionsFilter an array
Select values that satisfy a condition.
Read recipe →CollectionsTransform an array
Transform every element, or discard nil results.
Read recipe →CollectionsGroup values by a key
Create a dictionary of arrays from a collection.
Read recipe →CollectionsMerge dictionaries
Choose which value wins when keys collide.
Read recipe →StringsSplit a string
Split text into fields and trim whitespace.
Read recipe →StringsFind a substring
Check case-sensitive or case-insensitive matches.
Read recipe →StringsReplace a substring
Replace occurrences without changing the original value.
Read recipe →FilesRead a UTF-8 text file
Read a file and handle filesystem errors.
Read recipe →FilesWrite a UTF-8 text file
Save text using an atomic replacement.
Read recipe →BasicsModel choices with an enum
Name a finite set of states and switch over them.
Read recipe →BasicsThrow and handle an error
Represent a recoverable failure explicitly.
Read recipe →ConcurrencyCall an asynchronous function
Await a result at a possible suspension point.
Read recipe →ConcurrencyProtect shared state with an actor
Isolate mutable state behind actor methods.
Read recipe →NetworkingFetch JSON with URLSession
Validate HTTP status before decoding the response.
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