Solved the two questions of the JavaScript

1. Create an object composed of the properties given in the function
2. Filter an array of objects based on condition given by the function

Author: Devendra Parmar

October/CreateAnObjectComposedOfTheProperties.js

@@ -0,0 +1,9 @@
+// Write a JavaScript program to create an object composed of the properties the given function returns truthy for. The function is invoked with two arguments: (value, key).
+
+const pickBy = (obj, fn) => {
+  return Object.keys(obj)
+    .filter((k) => fn(obj[k], k))
+    .reduce((acc, key) => ((acc[key] = obj[key]), acc), {});
+};
+
+console.log(pickBy({ a: 1, b: "2", c: 3 }, (x) => typeof x === "number"));

October/FilterAnArrayOfObjectsBasedOnCondition.js

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+// Write a JavaScript program to filter an array of objects based on a condition while also filtering out unspecified keys.
+
+const reducedFilter = (data, keys, fn) => {
+  return data.filter(fn).map((el) =>
+    keys.reduce((acc, key) => {
+      acc[key] = el[key];
+      return acc;
+    }, {})
+  );
+};
+
+const data = [
+  {
+    id: 1,
+    name: "Darshan",
+    age: 22,
+  },
+  {
+    id: 2,
+    name: "Devendra",
+    age: 23,
+  },
+];
+
+console.log(reducedFilter(data, ["id", "name"], (item) => item.age > 22));