expr.substitute-method-[fsharp].md

title	Expr.Substitute Method (F#)
description	Expr.Substitute Method (F#)
keywords	visual f#, f#, functional programming
author	dend
manager	danielfe
ms.date	05/16/2016
ms.topic	language-reference
ms.prod	visual-studio-dev14
ms.technology	devlang-fsharp
ms.assetid	328e569e-f520-4723-a4fa-51d1ad754794

Expr.Substitute Method (F#)

Substitutes through the given expression using the given functions to map variables to new values. The functions must give consistent results at each application. Variable renaming may occur on the target expression if variable capture occurs.

Namespace/Module Path: Microsoft.FSharp.Quotations

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

Syntax

// Signature:
member this.Substitute : (Var -> Expr option) -> Expr

// Usage:
expr.Substitute (substitution)

Parameters

substitution Type: Var->Expr option

The function to map variables into expressions.

Return Value

The expression with the given substitutions.

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

Quotations.Expr Class (F#)

Microsoft.FSharp.Quotations Namespace (F#)