File: assoc.doc

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\DOC assoc

\TYPE {assoc : (* -> (* # **) list -> (* # **))}

\SYNOPSIS
Searches a list of pairs for a pair whose first component equals a specified
value.

\KEYWORDS
list.

\DESCRIBE
{assoc x [(x1,y1);...;(xn,yn)]} returns the first {(xi,yi)} in the list such
that {xi} equals {x}.

\FAILURE
Fails if no matching pair is found. This will always be the case if the list
is empty.

\EXAMPLE
{
#assoc 2 [(1,4);(3,2);(2,5);(2,6)];;
(2, 5) : (int # int)
}
\SEEALSO
rev_assoc, find, mem, tryfind, exists, forall.

\ENDDOC