Rename js snippets

snippets/js/s/pull-matching-values-from-array.md

@@ -0,0 +1,35 @@
+---
+title: Pull matching values from array
+type: snippet
+language: javascript
+tags: [array]
+cover: light-leaves
+dateModified: 2020-10-22T20:24:04+03:00
+---
+
+Mutates the original array to filter out the values specified.
+Returns the removed elements.
+
+- Use `Array.prototype.filter()` and `Array.prototype.includes()` to pull out the values that are not needed.
+- Set `Array.prototype.length` to mutate the passed in an array by resetting its length to `0`.
+- Use `Array.prototype.push()` to re-populate it with only the pulled values.
+- Use `Array.prototype.push()` to keep track of pulled values.
+
+```js
+const pullAtValue = (arr, pullArr) => {
+  let removed = [],
+    pushToRemove = arr.forEach((v, i) =>
+      pullArr.includes(v) ? removed.push(v) : v
+    ),
+    mutateTo = arr.filter((v, i) => !pullArr.includes(v));
+  arr.length = 0;
+  mutateTo.forEach(v => arr.push(v));
+  return removed;
+};
+```
+
+```js
+let myArray = ['a', 'b', 'c', 'd'];
+let pulled = pullAtValue(myArray, ['b', 'd']);
+// myArray = [ 'a', 'c' ] , pulled = [ 'b', 'd' ]
+```