feat: add compactObject snippet (#1670)

Add compactObject snippet
Co-authored-by: Anhzf <36941633+Epiclygend@users.noreply.github.com>
Co-authored-by: Angelos Chalaris <chalarangelo@gmail.com>

snippets/compactObject.md

@@ -0,0 +1,43 @@
+---
+title: compactObject
+tags: object,array,recursion,advanced
+---
+
+Deeply removes all falsy values from an object or array.
+
+- Use recursion.
+- Initialize the iterable data, using `Array.isArray()`, `Array.prototype.filter()` and `Boolean` for arrays in order to avoid sparse arrays.
+- Use `Object.keys()` and `Array.prototype.reduce()` to iterate over each key with an appropriate initial value.
+- Use `Boolean` to determine the truthiness of each key's value and add it to the accumulator if it's truthy.
+- Use `typeof` to determine if a given value is an `object` and call the function again to deeply compact it.
+
+```js
+const compactObject = val => {
+  const data = Array.isArray(val) ? val.filter(Boolean) : val;
+  return Object.keys(data).reduce(
+    (acc, key) => {
+      const value = data[key];
+      if (Boolean(value))
+        acc[key] = typeof value === 'object' ? compactObject(value) : value;
+      return acc;
+    },
+    Array.isArray(val) ? [] : {}
+  );
+};
+```
+
+```js
+const obj = {
+  a: null,
+  b: false,
+  c: true,
+  d: 0,
+  e: 1,
+  f: '',
+  g: 'a',
+  h: [null, false, '', true, 1, 'a'],
+  i: { j: 0, k: false, l: 'a' }
+};
+compactObject(obj);
+// { c: true, e: 1, g: 'a', h: [ true, 1, 'a' ], i: { l: 'a' } }
+```