1 The Lens Guide

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1 The Lens Guide🔗ℹ

This guide is intended for programmers who are familiar with Racket but new to working with lenses or a certain part of this lens library. It contains a non-authorative introduction to lenses, including examples of usage and recipes for solving certain kinds of problems. It does not describe all features this library provides; for a complete API reference, see The Lens Reference.

1.1 Introduction to Lenses

1.1.1 What are lenses?

1.1.2 Why use lenses?

1.2 Lenses on Built-In Datatypes

1.2.1 Lenses on Ordered Data

1.2.1.1 Pairs and Lists

1.2.1.2 Vectors and Strings

1.2.1.3 Streams

1.2.2 Lenses on Key-Value Data

1.2.2.1 Hash Tables

1.2.2.2 Dictionaries

1.3 Lenses on User-Defined Datatypes

1.3.1 Structures

1.3.2 Constructing Entirely New Lenses

1.1	Introduction to Lenses
1.2	Lenses on Built-In Datatypes
1.3	Lenses on User-Defined Datatypes