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<head><title>#? -- check for presence of elements</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="_operators.html" title="">operators</a> > <a href="__sh_qu.html" title="check for presence of elements">#?</a></div>
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<div><h1>#? -- check for presence of elements</h1>
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<div class="single"><h2>See also</h2>
<ul><li><span><a href="__sh.html" title="length, or access to elements">#</a> -- length, or access to elements</span></li>
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<div class="waystouse"><h2>Ways to use <tt>#?</tt> :</h2>
<ul><li><span><a href="___Basic__List_sp_sh_qu_sp__Z__Z.html" title="check for element in list">BasicList #? ZZ</a> -- check for element in list</span></li>
<li><span><a href="___Database_sp_sh_qu_sp__String.html" title="check for value in database">Database #? String</a> -- check for value in database</span></li>
<li><span><a href="___Hash__Table_sp_sh_qu_sp__Thing.html" title="check for value in hash table">HashTable #? Thing</a> -- check for value in hash table</span></li>
<li><span><a href="___Set_sp_sh_qu_sp__Thing.html" title="test set membership">Set #? Thing</a> -- test set membership</span></li>
<li><span><a href="___String_sp_sh_qu_sp__Z__Z.html" title="check for character in string">String #? ZZ</a> -- check for character in string</span></li>
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<div class="waystouse"><h2>For the programmer</h2>
<p>The object <a href="__sh_qu.html" title="check for presence of elements">#?</a> is <span>a <a href="___Keyword.html">keyword</a></span>.</p>
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