25 lines
743 B
Markdown
25 lines
743 B
Markdown
---
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title: Iterate over object's own properties in reverse
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tags: object
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cover: sea-view
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firstSeen: 2018-01-18T16:45:56+02:00
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lastUpdated: 2020-10-19T22:49:51+03:00
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---
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Iterates over all own properties of an object in reverse, running a callback for each one.
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- Use `Object.keys()` to get all the properties of the object, `Array.prototype.reverse()` to reverse their order.
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- Use `Array.prototype.forEach()` to run the provided function for each key-value pair.
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- The callback receives three arguments - the value, the key and the object.
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```js
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const forOwnRight = (obj, fn) =>
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Object.keys(obj)
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.reverse()
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.forEach(key => fn(obj[key], key, obj));
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```
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```js
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forOwnRight({ foo: 'bar', a: 1 }, v => console.log(v)); // 1, 'bar'
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```
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