Object-Oriented JavaScript — Errors and Iterables

Error objects and creating iterables.

JavaScript is partly an object-oriented language.

To learn JavaScript, we got to learn the object-oriented parts of JavaScript.

In this article, we’ll look at the error object and iterables.

Error Objects

JavaScript throw Error objects when an error is encountered.

They include various constructors.

They include EvalError, RangeError, ReferenceError, SyntaxError, TypeError, and URIError.

All of these constructors inherit from Error .

We can put code that may throw errors within the try block.

And we can catch the error in the catch block.

For instance, we can write:

try {
  foo();
} catch (e) {
  //...
}

If foo throws an error, then the catch block will catch the error.

e has the error object thrown.

We can get the name with e.name and the message with e.message .

We can add a finally clause to run code regardless of whether an error is thrown.

For instance, we can write:

try {
  foo();
} catch (e) {
  //...
} finally {
  console.log('finally');
}

javascript programming

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