The programs in the book are written in an old subset of Scheme, which is a dialect of Lisp.

Online Book

1. Install Racket
2. Install Magical Racket on VS Code
3. Use the SICP Collection

An alias for ().

• x : number?
• Returns (+ x 1).

• x : number?
• Returns (- x 1).

The null/empty stream.

Produces a stream.

• s : stream?
• Returns #t if s is the-empty-stream, #f otherwise.

Returns the current time measured as the number of microseconds passed since a fixed beginning.

• n : positive?
• Returns a random integer between 0 and n-1 (inclusive) if n is an exact integer. Otherwise, returns a random inexact number between 0 and n (exclusive).

The amb operator.

Additionally, true, false, identity, and error are provided from Racket.