30 lines
772 B
Markdown
30 lines
772 B
Markdown
---
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title: Attempt invoking a function
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tags: function
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expertise: intermediate
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firstSeen: 2018-01-28T14:44:40+02:00
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lastUpdated: 2020-10-18T20:24:28+03:00
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---
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Attempts to invoke a function with the provided arguments, returning either the result or the caught error object.
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- Use a `try...catch` block to return either the result of the function or an appropriate error.
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- If the caught object is not an `Error`, use it to create a new `Error`.
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```js
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const attempt = (fn, ...args) => {
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try {
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return fn(...args);
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} catch (e) {
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return e instanceof Error ? e : new Error(e);
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}
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};
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```
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```js
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var elements = attempt(function(selector) {
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return document.querySelectorAll(selector);
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}, '>_>');
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if (elements instanceof Error) elements = []; // elements = []
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```
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