Siderite / LInQer, Hacker News

• the static from, empty, range, repeat
• concat
• count
• distinct
• elementAt and elementAtOrDefault
• first and firstOrDefault
• last and lastOrDefault
• min, max, stats (min, max and count)
• select
• skip and take
• sum and sumAndCount (sum and count)
• toArray
• toList – similar to toArray, but returns an Enumerable (itself if already seekable)
• where

Reference Linqer.js for all of the original Enumerable methods, the ones in slim plus:

• aggregate
• all
• any
• append
• average
• asEnumerable
• cast
• contains
• defaultIfEmpty – throws not implemented
• except
• intersect
• longCount
• ofType
• prepend
• reverse
• selectMany
• sequenceEqual
• single
• singleOrDefault
• skipLast
• skipWhile
• takeLast
• takeWhile
• toDictionary – throws not implemented
• toMap
• toObject
• toHashSet – throws not implemented
• toSet
• toList – throws not implemented
• union
• zip

Reference Linqer.extra.js (needs Linqer.js) for some additional methods:

• shuffle – randomizes the enumerable
• randomSample – implements random reservoir sampling of k items
• distinctByHash – distinct based on a hashing function, not a comparer – faster
• exceptByHash – except based on a hashing function, not a comparer – faster
• intersectByHash – intersect based on a hashing function, not a comparer – faster
• binarySearch – find the index of a value in a sorted enumerable by binary search
• lag – joins each item of the enumerable with previous items from the same enumerable
• lead – joins each item of the enumerable with next items from the same enumerable
• padStart – pad enumerable at the start to a minimum length
• padEnd – pad enumerable at the end to a minimum length

const source=… an array or a generator function or anything that is iterable …; const enumerable=Linqer.Enumerable.from (source); // now you can both iterate and use LINQ like functions const result=enumerable                 .where (item=> !! item.value) // like filter                 .select (item=> {value: item.value, key: item.name}) // like map                 .groupBy (item=> item.key)                 .where (g=> g.length> 90                 .selectMany ()                 .skip (90                 .take (5)                 .toArray ();

.

Building the solution

The source files have been moved to Typescript. Run build.bat to create the js and map files.