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async.js
JavaScript
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var asyncExample = function(a,b,callback){
var returnValue,returnError;//define stuff
try { //do the stuff
returnValue = doStuff(a,b);
} catch(err) { //if there is an err catch it
returnError = err;
} finally { //send it back
callback(returnError, returnValue);
}
}//program will not have to wait

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