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@ -3,14 +3,15 @@ title: findKey
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tags: object,intermediate
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---
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Returns the first key that satisfies the provided testing function.
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Finds the first key that satisfies the provided testing function.
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Otherwise `undefined` is returned.
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- Use `Object.keys(obj)` to get all the properties of the object, `Array.prototype.find()` to test each key-value pair using `fn`.
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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 findKey = (obj, fn) => Object.keys(obj).find(key => fn(obj[key], key, obj));
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const findKey = (obj, fn) =>
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Object.keys(obj).find(key => fn(obj[key], key, obj));
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```
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```js
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