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Error Handling
Error handling is the technique to handle different kinds of error in application. It usually consists of try, catch and finally keyword.
try{
let a= 1;
let b = 0;
let c = a/b; // cannot divide by 0
}
catch(err){
console.log(err.message)
}
finally{
// it will run irrespective of try and catch
console.log('done')
}
output
//error message
done
Throw custom error
You can throw custom error by throw keyword.
try{
let num = 1;
let den = 0;
if(den==0){
throw 'denominator cannot be zero';
}
}
catch(err){
console.log(err.message) //denominator cannot be zero
}
finally{
console.log('please retry')
}
output
denomiator cannot be zero
please retry
beeter way [throwing error]
using error constructor
throw new Error(message,options)
throw new Error('denominator cannot be zero ${name}')
learning resources
🧡Scaler - India's Leading software E-learning
🧡w3schools - for web developers
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