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Update deepGet.md

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Angelos Chalaris
2019-05-09 13:48:15 +03:00
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commit 5c4c34ff5d
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@ -1,16 +1,17 @@
### deepGet ### deepGet
Returns the target value in a nested JSON object, based on the keys array. Returns the target value in a nested JSON object, based on the `keys` array.
Contrust the keys you want in the nested JSON object as an `Array`. Compare the keys you want in the nested JSON object as an `Array`.
Use `Array.prototype.reduce()` to get value from nested JSON object one by one. if the key exists in object, return target value, otherwise, return null. Use `Array.prototype.reduce()` to get value from nested JSON object one by one.
If the key exists in object, return target value, otherwise, return `null`.
```js ```js
const deepGet = (obj, keys) => keys.reduce((xs, x) => (xs && xs[x]) ? xs[x] : null, obj) const deepGet = (obj, keys) => keys.reduce((xs, x) => (xs && xs[x]) ? xs[x] : null, obj)
``` ```
```js ```js
let idx = 2; // or variable from other places let index = 2;
const data = { const data = {
foo: { foo: {
foz: [1, 2, 3], foz: [1, 2, 3],
@ -19,6 +20,6 @@ const data = {
} }
} }
}; };
deepGet(data, ['foo', 'foz', idx]); // get 3 deepGet(data, ['foo', 'foz', index]); // get 3
deepGet(data, ['foo', 'bar', 'baz', 8, 'foz']); // null deepGet(data, ['foo', 'bar', 'baz', 8, 'foz']); // null
``` ```