► |  | The Racket Reference

1 | Language Model
2 | Syntactic Forms
3 | Datatypes
4 | Structures
5 | Classes and Objects
6 | Units
7 | Contracts
8 | Pattern Matching
9 | Control Flow
10 | Concurrency and Parallelism
11 | Macros
12 | Input and Output
13 | Reflection and Security
14 | Operating System
15 | Memory Management
16 | Unsafe Operations
17 | Running Racket
| Bibliography
| Index

▼ | 7 | Contracts

7.1 | Data-structure Contracts
7.2 | Function Contracts
7.3 | Parametric Contracts
7.4 | Lazy Data-structure Contracts
7.5 | Structure Type Property Contracts
7.6 | Attaching Contracts to Values
7.7 | Building New Contract Combinators
7.8 | Contract Utilities
7.9 | racket/ contract/ base
7.10 | Legacy Contracts
7.11 | Random generation

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contract-random-generate

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#### 7.11`` Random generation

> procedure (contract-random-generate ctc fuel [fail]) → any/c
> ctc : contract?
> fuel : int?
> fail : (-> any/c) = (λ () (error ...))

Attempts to randomly generate a value which will match the contract. The fuel argument limits how hard the generator tries to generate a value matching the contract and is a rough limit of the size of the resulting value.

The generator may fail to generate a contract, either because some contracts do not have corresponding generators (for example, not all predicates have generators) or because there is not enough fuel. In either case, the thunk fail is invoked.

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