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procedure_hasvalue.html
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<title>"HasValue" Procedure - TMBASIC</title>
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<div class="backlinks"><a href="doc.html">TMBASIC Documentation</a> <wbr>► <a href="procedures_optionals.html">Procedures: Optionals</a></div><h1><span class="tt">HasValue</span> Procedure</h1>Determines whether an <a href="type_optional.html">Optional</a> contains a value of the underlying type, or whether it is <span class="tt">none</span>.<div class="bar"><span>Declaration</span></div><div class="code"><div>function HasValue(this as Optional T) as Boolean</div></div><h3>Parameters</h3><ul><li><i>this</i> as <a href="type_optional.html">Optional T</a> — Any <a href="type_optional.html">Optional</a> value.</li></ul><h3>Return value</h3><a href="type_boolean.html">Boolean</a> — If <i>this</i> contains a value (of type <i>T</i>), then <a href="procedure_hasvalue.html">HasValue</a> returns <span class="tt">true</span>. Otherwise, it returns <span class="tt">false</span>.<h3>Example</h3>This example shows how <a href="procedure_hasvalue.html">HasValue</a> responds to changes in an <a href="type_optional.html">Optional</a> <a href="type_number.html">Number</a> variable.<div class="bar"><span>Code</span></div><div class="code"><div>dim x as Optional Number</div><div>if not HasValue(x) then print <span class="string">"HasValue is initially false"</span></div><pre></pre><div>let x = 123</div><div>if HasValue(x) then print <span class="string">"HasValue is now true"</span></div><pre></pre><div>let x = none</div><div>if not HasValue(x) then Print <span class="string">"HasValue is false again"</span></div></div><div class="bar"><span>Output</span></div><div class="code"><div>HasValue is initially false</div><div>HasValue is now true</div><div>HasValue is false again</div></div>
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