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    <p><code>Javascript</code> doesn't have the <code>keyword</code> <code>string</code> in first place.</p> <p>You are not supposed to give datatypes for variables, you may not even use <code>var</code> keyword before formal parameters.</p> <p><code>Javascript</code> interpreter can understand the type of the value a variable pointing. Since, variables doesn't have any types in particular and can be messed up any way, hence it is called <code>weakly typed language</code>.</p> <p>Changing <code>function showdiagnosis(string pid){}</code> to </p> <pre><code> `function showdiagnosis(pid){}` </code></pre> <p>If you need you can use <code>typeof</code> keyword to know the type value passed through pid.</p> <p>For example:</p> <pre><code> function showDiagnosis(pid){ if(typeof pid=='string') //................ } </code></pre> <p>This link is valuable and you may want to check it: </p> <p><a href="https://stackoverflow.com/questions/4456336/finding-variable-type-in-javascript">Finding variable type in javascript</a></p> <p><a href="https://stackoverflow.com/questions/4059147/check-if-a-variable-is-a-string">Check if a variable is a string</a></p> <p><a href="https://stackoverflow.com/questions/1303646/check-whether-variable-is-number-or-string-in-javascript">Check whether variable is number or string in javascript</a></p> <p>And use proper naming conventions for function names, variables. In general, <code>Javascript</code> community follows <code>showDiagnosis(pid)</code> for your case. Start with small letter and capitalize every first letter of distinct words in the name so that it makes some sense for readers and increases readability.</p>
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