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Add function setItem #672

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Add function setItem #672

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13 changes: 13 additions & 0 deletions src/FSharpPlus/Operators.fs
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Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,8 @@ namespace FSharpPlus
open System
open FSharpPlus.Control

#nowarn "0077" // Member constraints with the name 'set_Item' ...

/// Generic functions and operators
[<AutoOpenAttribute>]
module Operators =
Expand Down Expand Up @@ -849,6 +851,17 @@ module Operators =
/// <category index="16">Indexable</category>
let inline tryItem (n: 'K) (source: '``Indexed<'T>``) : 'T option = TryItem.Invoke n source

/// <summary>
/// Mutates an item at the given key/index.
/// </summary>
/// <param name="item">The key/index where to set the value.</param>
/// <param name="value">The value to set.</param>
/// <param name="source">The input collection.</param>
/// <returns>unit</returns>
/// <remarks>This function requires that the source type has a mutable indexer.</remarks>
/// <category index="16">Indexable</category>
let inline setItem (item: 'K) (value: 'T) (source: ^``Indexed<'T>``) = (^``Indexed<'T>`` : (member set_Item : 'K -> 'T -> unit) (source, item, value))

/// <summary>
/// Maps with access to the index.
/// </summary>
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