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javascript/snippets/get.md

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+---
+title: Get nested object property from path string
+type: snippet
+tags: [object,regexp]
+cover: brown-bird
+dateModified: 2020-10-19T22:49:51+03:00
+---
+
+Retrieves a set of properties indicated by the given selectors from an object.
+
+- Use `Array.prototype.map()` for each selector, `String.prototype.replace()` to replace square brackets with dots.
+- Use `String.prototype.split()` to split each selector.
+- Use `Array.prototype.filter()` to remove empty values and `Array.prototype.reduce()` to get the value indicated by each selector.
+
+```js
+const get = (from, ...selectors) =>
+  [...selectors].map(s =>
+    s
+      .replace(/\[([^\[\]]*)\]/g, '.$1.')
+      .split('.')
+      .filter(t => t !== '')
+      .reduce((prev, cur) => prev && prev[cur], from)
+  );
+```
+
+```js
+const obj = {
+  selector: { to: { val: 'val to select' } },
+  target: [1, 2, { a: 'test' }],
+};
+get(obj, 'selector.to.val', 'target[0]', 'target[2].a');
+// ['val to select', 1, 'test']
+```