length -- r7rs Definition

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Kind

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procedure;

Implemented by

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• length (from vonuvoli);

Procedure signature

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Procedure variants:

• ((null) -> (range-length-zero))
  • input: a value of type null;
  • output: a value of type range-length-zero;
• ((list-proper-not-null) -> (range-length-not-zero))
  • input: a value of type list-proper-not-null;
  • output: a value of type range-length-not-zero;

Exports

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• scheme:base -- (scheme base);

Exports recursive

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• scheme -- (scheme);

Description

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(length list)

Returns the length of list.

(length '(a b c))               ===>  3
(length '(a (b) (c d e)))       ===>  3
(length '())                    ===>  0

---

The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• null;
• range-length-zero;
• list-proper-not-null;
• range-length-not-zero;