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javascript/snippets/attempt.md

@@ -0,0 +1,29 @@
+---
+title: Attempt invoking a function
+type: snippet
+tags: [function]
+cover: spanish-resort
+dateModified: 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`.
+
+```js
+const attempt = (fn, ...args) => {
+  try {
+    return fn(...args);
+  } catch (e) {
+    return e instanceof Error ? e : new Error(e);
+  }
+};
+```
+
+```js
+var elements = attempt(function(selector) {
+  return document.querySelectorAll(selector);
+}, '>_>');
+if (elements instanceof Error) elements = []; // elements = []
+```