26 lines
834 B
Markdown
26 lines
834 B
Markdown
---
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title: get
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tags: object,intermediate
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---
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Retrieve a set of properties indicated by the given selectors from an object.
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- Use `Array.prototype.map()` for each selector, `String.prototype.replace()` to replace square brackets with dots.
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- Use `String.prototype.split('.')` to split each selector, `Array.prototype.filter()` to remove empty values and `Array.prototype.reduce()` to get the value indicated by it.
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```js
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const get = (from, ...selectors) =>
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[...selectors].map(s =>
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s
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.replace(/\[([^\[\]]*)\]/g, '.$1.')
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.split('.')
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.filter(t => t !== '')
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.reduce((prev, cur) => prev && prev[cur], from)
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);
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```
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```js
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const obj = { selector: { to: { val: 'val to select' } }, target: [1, 2, { a: 'test' }] };
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get(obj, 'selector.to.val', 'target[0]', 'target[2].a'); // ['val to select', 1, 'test']
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```
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