Add solution #2634

Author: JoshCrozier

README.md

@@ -386,6 +386,7 @@
 2627|[Debounce](./2627-debounce.js)|Medium|
 2629|[Function Composition](./2629-function-composition.js)|Easy|
 2630|[Memoize II](./2630-memoize-ii.js)|Hard|
+2634|[Filter Elements from Array](./2634-filter-elements-from-array.js)|Easy|
 2637|[Promise Time Limit](./2637-promise-time-limit.js)|Medium|
 2648|[Generate Fibonacci Sequence](./2648-generate-fibonacci-sequence.js)|Easy|
 2649|[Nested Array Generator](./2649-nested-array-generator.js)|Medium|

solutions/2634-filter-elements-from-array.js

@@ -0,0 +1,34 @@
+/**
+ * 2634. Filter Elements from Array
+ * https://leetcode.com/problems/filter-elements-from-array/
+ * Difficulty: Easy
+ *
+ * Given an integer array arr and a filtering function fn, return a filtered array filteredArr.
+ *
+ * The fn function takes one or two arguments:
+ * arr[i] - number from the arr
+ * i - index of arr[i]
+ *
+ * filteredArr should only contain the elements from the arr for which the expression
+ * fn(arr[i], i) evaluates to a truthy value. A truthy value is a value where
+ * Boolean(value) returns true.
+ *
+ * Please solve it without the built-in Array.filter method.
+ */
+
+/**
+ * @param {number[]} arr
+ * @param {Function} fn
+ * @return {number[]}
+ */
+var filter = function(arr, fn) {
+  const result = [];
+
+  for (let i = 0; i < arr.length; i++) {
+    if (fn(arr[i], i)) {
+      result.push(arr[i]);
+    }
+  }
+
+  return result;
+};