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The Lean Language Reference
1.
Introduction
2.
Elaboration and Compilation
3.
The Lean Language
4.
Terms
5.
Monads and
do
-Notation
6.
IO
7.
Tactic Proofs
8.
The Simplifier
9.
Basic Types
10.
Standard Library
11.
Notations and Macros
12.
Output from Lean
13.
Elan
14.
Lake and Reservoir
Index
10.
Standard Library
10.1.
Optional Values
10.1.
Optional Values
Source Code
Report Issues
10.1. Optional Values
🔗
Planned Content
Describe
Option
, including the default coercions and its API.
Tracked at issue
#110