Attempt invoking a function

JavaScript, Function · Oct 18, 2020

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 = []

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