try...catch

The try...catch statement is used to handle exceptions.

Syntax

try {
  // Statements
}
catch (error) {
  // Statements
}
finally {
  // Statements
}

The try block contains codes, that can throw exceptions. The catch block runs when an exception occurs in code present inside the try block. The finally block runs regardless.

Example

const number = "this is not a number";
try {
  if(isNaN(number)) {
    throw "Please only enter a number";
  }
}
catch (error) {
  console.log(error);
}
finally {
  console.log("this runs regardless";
}
/* Prints:
Please only enter a number
this runs regardless
*/

The try block tries to run the code without exception, if it succeeds then it moves on to the finally block. If it throws an exception then it goes to the catch block, and then finally to the finally block.