Index

public protocol Index

Index provides an AffineTraversal for this structure to focus on an optional IndexFoci at a given index IndexType.

Provides an AffineTraversal that focuses on a value at a given index.

Swift

static func index(_ i: IndexType) -> AffineTraversal<Self, IndexFoci>

`i`	Index to focus on.

An AffineTraversal optic that focuses on a value of this structure.


                    
                    
                    
                      index(_:iso:)

Extension method

Pre-composes the AffineTraversal provided by this Index with an isomorphism.

Swift

static func index<B>(_ i: IndexType, iso: Iso<B, Self>) -> AffineTraversal<B, IndexFoci>

`i`	Index to focus this structure.
`iso`	An isomorphism.

An AffineTraversal optic between a structure that is isomorphic to this one and the same foci, focused at the provided index.


                    
                    
                    
                      index(_:iso:)

Extension method

Post-composes the AffineTraversal provided by this Index with an isomorphism.

Swift

static func index<B>(_ i: IndexType, iso: Iso<IndexFoci, B>) -> AffineTraversal<Self, B>

`i`	Index to focus this structure.
`iso`	An isomorphism.

An AffineTraversal between this optic and new foci isomorphic to the original one, focused at the provided index.