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<!DOCTYPE html>
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<title>Lazy Sequences</title>
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<h1>SRFI 127: Lazy Sequences</h1>
<p class="authors">by John Cowan</p>
<p class="based-on"></p>
<p class="status">status: <em>final</em> (2016-01-18)</p>
<p class="keywords">keywords: <a href="https://srfi.schemers.org/?keywords=data-structure">Data Structure</a>, <a href="https://srfi.schemers.org/?keywords=r7rs-large">R7RS Large</a>, <a href="https://srfi.schemers.org/?keywords=r7rs-large-red">R7RS Large: Red Edition</a></p>
<p class="library-name">library name: lazy-sequences</p>
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<h2>Abstract</h2> <p>Lazy sequences (or lseqs, pronounced
"ell-seeks") are a generalization of lists. In particular, an lseq is
either a proper list or a dotted list whose last cdr is a <a href="https://srfi.schemers.org/srfi-121/">SRFI 121</a> generator. A generator is a procedure that can
be invoked with no arguments in order to lazily supply additional
elements of the lseq. When a generator has no more elements to return, it
returns an end-of-file object. Consequently, lazy sequences cannot
reliably contain end-of-file objects.
<p>This SRFI provides a set of procedures suitable
for operating on lazy sequences based on <a href="https://srfi.schemers.org/srfi-1/">SRFI
1</a>.</body></html>