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<head><title>hashTable -- make a hash table</title>
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<div><a href="index.html" title="">Macaulay2Doc</a> > <a href="___The_sp__Macaulay2_splanguage.html" title="">The Macaulay2 language</a> > <a href="_hash_sptables.html" title="">hash tables</a> > <a href="_hash__Table.html" title="make a hash table">hashTable</a></div>
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<div><h1>hashTable -- make a hash table</h1>
<div class="single"><h2>Description</h2>
<div><tt>hashTable(h,v)</tt> -- produce a hash table from a list <tt>v</tt> of key-value pairs, with an optional collision handler function <tt>h</tt>.<p/>
The pairs may be of the form <tt>a=>b</tt>, <tt>{a,b}</tt>, or <tt>(a,b)</tt>.<p/>
Missing entries in the list, represented by <a href="_null.html" title="the unique member of the empty class">null</a>, will be silently ignored.<p/>
<table class="examples"><tr><td><pre>i1 : x = hashTable {a=>b, c=>d, }
o1 = HashTable{a => b}
c => d
o1 : HashTable</pre>
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<tr><td><pre>i2 : x#a
o2 = b
o2 : Symbol</pre>
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<tr><td><pre>i3 : hashTable(plus, {(a,3),(b,4),(a,10)})
o3 = HashTable{a => 13}
b => 4
o3 : HashTable</pre>
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<div class="waystouse"><h2>Ways to use <tt>hashTable</tt> :</h2>
<ul><li>hashTable(List)</li>
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