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Angelos Chalaris
2020-09-15 16:28:04 +03:00
parent 040efd4380
commit 53c16dbf65
401 changed files with 969 additions and 950 deletions
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5
snippets/findKey.md
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@ -5,7 +5,8 @@ tags: object,function,intermediate
Returns the first key that satisfies the provided testing function. Otherwise `undefined` is returned.
Use `Object.keys(obj)` to get all the properties of the object, `Array.prototype.find()` to test the provided function for each key-value pair. The callback receives three arguments - the value, the key and the object.
- Use `Object.keys(obj)` to get all the properties of the object, `Array.prototype.find()` to test the provided function for each key-value pair.
- The callback receives three arguments - the value, the key and the object.
```js
const findKey = (obj, fn) => Object.keys(obj).find(key => fn(obj[key], key, obj));
@ -20,4 +21,4 @@ findKey(
},
o => o['active']
); // 'barney'
```
```