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Day50Errorhanding.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Day 50</title>
</head>
<body>
<script>
// runtime errors only handled by try catch block
try{
const name='ponmani';
name="arthi";
}
catch(err){
console.log(err);
console.log(err.name);// type error
console.log(err.message);// assignment to the constant varible
}
finally{
console.log('code has been ended'); // it will run irrespective of error
}
// try catch runs synchoronusly
try{
setTimeout(()=>nosuchvarible,1000);// this will be considered has a uncaught
}
catch{
console.log('this wont work here')
}
// we can solve that using promise
try{
new Promise(resolve,reject)
{
setTimeout(()=>reject(nosuchvarible),1000);// this will be considered has a uncaught
}
}
catch{
console.log('this will work here because of promise')
}
class Validationerror extends Error{
constructor(message){
super(message)
this.name='validationerror';
}
}
function test(){
throw new Validationerror('validation error occurs please check');
}
try{
test();
}
catch(err){
console.log(err.name);
console.log(err.message);
console.log(err.stack);
}
</script>
</body>
</html>