30-seconds-of-code/snippets/attempt.md

title, tags, firstSeen, lastUpdated

title	tags	firstSeen	lastUpdated
Attempt invoking a function	function,intermediate	2018-01-28T14:44:40+02:00	2020-10-18T20:24:28+03:00

Attempts to invoke a function with the provided arguments, returning either the result or the caught error object.

• Use a try...catch block to return either the result of the function or an appropriate error.
• If the caught object is not an Error, use it to create a new Error.

const attempt = (fn, ...args) => {
  try {
    return fn(...args);
  } catch (e) {
    return e instanceof Error ? e : new Error(e);
  }
};

var elements = attempt(function(selector) {
  return document.querySelectorAll(selector);
}, '>_>');
if (elements instanceof Error) elements = []; // elements = []