Call Javascript function only if it is defined

function1() is in "script1.js"
function2() is in "script2.js"
"Cumulative.jsp" includes "script1.js" & "script2.js"
I'm calling function1() from function2(). I want to check the availability of function1() before calling it from function2().

i.e even if I don't include "script1.js" in "Cumulative.jsp", function2() should not give error while calling function1()
Ravi KallaTechnology LeadAsked:
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
try do a try catch in your javascript to prevent error ? like:

function2() {

   try {

   } catch (e) {}


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Om PrakashCommented:
You can check if a function exists of not
<script language="javascript" type="text/javascript">
function test() {

if(window.test) {
  alert('test exists');
else {
  alert('test does not exists');
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