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Visual F#
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Visual F# Guided Tour
Using Visual Studio to Write F# Programs
F# Language Reference
F# Compiler (fsc.exe) Reference
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F# Core Library Reference
Microsoft.FSharp.Collections Namespace
Array Module
Array.Parallel Module
Array.append<'T> Function
Array.average<^T> Function
Array.averageBy<'T,^U> Function
Array.blit<'T> Function
Array.choose<'T,'U> Function
Array.collect<'T,'U> Function
Array.compareWith<'T> Function
Array.concat<'T> Function
Array.contains<'T> Function
Array.copy<'T> Function
Array.countBy<'T,'Key> Function
Array.create<'T> Function
Array.distinct['t] Function
Array.empty<'T> Type Function
Array.exists<'T> Function
Array.exists2<'T1,'T2> Function
Array.fill<'T> Function
Array.filter<'T> Function
Array.find<'T> Function
Array.findIndex<'T> Function
Array.fold<'T,'State> Function
Array.fold2<'T1,'T2,'State> Function
Array.foldBack<'T,'State> Function
Array.foldBack2<'T1,'T2,'State> Function
Array.forall<'T> Function
Array.forall2<'T1,'T2> Function
Array.get<'T> Function
Array.init<'T> Function
Array.isEmpty<'T> Function
Array.iter<'T> Function
Array.iter2<'T1,'T2> Function
Array.iteri<'T> Function
Array.iteri2<'T1,'T2> Function
Array.length<'T> Function
Array.map<'T,'U> Function
Array.map2<'T1,'T2,'U> Function
Array.mapi<'T,'U> Function
Array.mapi2<'T1,'T2,'U> Function
Array.max<'T> Function
Array.maxBy<'T,'U> Function
Array.min<'T> Function
Array.minBy<'T,'U> Function
Array.ofList<'T> Function
Array.ofSeq<'T> Function
Array.partition<'T> Function
Array.permute<'T> Function
Array.pick<'T,'U> Function
Array.reduce<'T> Function
Array.reduceBack<'T> Function
Array.rev<'T> Function
Array.scan<'T,'State> Function
Array.scanBack<'T,'State> Function
Array.set<'T> Function
Array.sort<'T> Function
Array.sortBy<'T,'Key> Function
Array.sortInPlace<'T> Function
Array.sortInPlaceBy<'T,'Key> Function
Array.sortInPlaceWith<'T> Function
Array.sortWith<'T> Function
Array.sub<'T> Function
Array.sum<^T> Function
Array.sumBy<'T,^U> Function
Array.toList<'T> Function
Array.toSeq<'T> Function
Array.tryFind<'T> Function
Array.tryFindIndex<'T> Function
Array.tryPick<'T,'U> Function
Array.unzip<'T1,'T2> Function
Array.unzip3<'T1,'T2,'T3> Function
Array.zeroCreate<'T> Function
Array.zip<'T1,'T2> Function
Array.zip3<'T1,'T2,'T3> Function
Array2D Module
Array3D Module
Array4D Module
ComparisonIdentity Module
HashIdentity Module
List Module
list<'T> Type Abbreviation
List<'T> Union
Map<'Key,'Value> Class
Collections.Map Module
Collections.ResizeArray<'T> Type Abbreviation
Collections.Seq Module
Collections.seq<'T> Type Abbreviation
Collections.Set<'T> Class
Collections.Set Module
Microsoft.FSharp.Control Namespace (F#)
Microsoft.FSharp.Core Namespace (F#)
Microsoft.FSharp.Core.CompilerServices Namespace (F#)
Microsoft.FSharp.Data Namespace
Microsoft.FSharp.Linq Namespace (F#)
Microsoft.FSharp.NativeInterop Namespace (F#)
Microsoft.FSharp.Quotations Namespace (F#)
Microsoft.FSharp.Reflection Namespace (F#)
System Namespace (F#)
System.Collections Namespace (F#)
System.Numerics Namespace (F#)
System.Threading Namespace (F#)
Visual F# Samples and Walkthroughs
Type Providers (F#)
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Array.maxBy<'T,'U> Function (F#)

Den Delimarsky|Last Updated: 6/20/2018
|
2 Contributors

Returns the greatest of all elements of the array, compared by using Operators.max on the function result.

Namespace/Module Path: Microsoft.FSharp.Collections.Array

Assembly: FSharp.Core (in FSharp.Core.dll)

Syntax

// Signature:
Array.maxBy : ('T -> 'U) -> 'T [] -> 'T (requires comparison)

// Usage:
Array.maxBy projection array

Parameters

projection Type: 'T -> 'U

The function to transform the elements into a type supporting comparison.

array Type: 'T[]

The input array.

Return Value

Returns the maximum element.

Remarks

This function is named MaxBy in compiled assemblies. If you are accessing the function from a language other than F#, or through reflection, use this name.
Ties are resolved by returning the element with the lowest ordinal.

Example

The following code example demonstrates the use of Array.maxBy.


[| -10.0 .. 10.0 |]
|> Array.maxBy (fun x -> 1.0 - x * x)
|> printfn "%A"

Output

0.0

Platforms

Windows 8, Windows 7, Windows Server 2012, Windows Server 2008 R2

Version Information

F# Core Library Versions

Supported in: 2.0, 4.0, Portable

See Also

Collections.Array Module (F#)

Microsoft.FSharp.Collections Namespace (F#)

© 2018 Microsoft