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javascript/snippets/for-own.md

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+---
+title: Iterate over object's own properties
+type: snippet
+tags: [object]
+cover: blank-card
+dateModified: 2020-10-22T20:23:47+03:00
+---
+
+Iterates over all own properties of an object, running a callback for each one.
+
+- Use `Object.keys()` to get all the properties of the object.
+- Use `Array.prototype.forEach()` to run the provided function for each key-value pair.
+- The callback receives three arguments - the value, the key and the object.
+
+```js
+const forOwn = (obj, fn) =>
+  Object.keys(obj).forEach(key => fn(obj[key], key, obj));
+```
+
+```js
+forOwn({ foo: 'bar', a: 1 }, v => console.log(v)); // 'bar', 1
+```