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Java-based LeetCode algorithm problem solutions, regularly updated

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2705\. Compact Object

Medium

Given an object or array `obj`, return a **compact object**. A **compact object** is the same as the original object, except with keys containing **falsy** values removed. This operation applies to the object and any nested objects. Arrays are considered objects where the indices are keys. A value is considered **falsy** when `Boolean(value)` returns `false`.

You may assume the `obj` is the output of `JSON.parse`. In other words, it is valid JSON.

**Example 1:**

**Input:** obj = [null, 0, false, 1]

**Output:** [1]

**Explanation:** All falsy values have been removed from the array.

**Example 2:**

**Input:** obj = {"a": null, "b": [false, 1]}

**Output:** {"b": [1]}

**Explanation:** obj["a"] and obj["b"][0] had falsy values and were removed.

**Example 3:**

**Input:** obj = [null, 0, 5, [0], [false, 16]]

**Output:** [5, [], [16]]

**Explanation:** obj[0], obj[1], obj[3][0], and obj[4][0] were falsy and removed.

**Constraints:**

*   `obj is a valid JSON object`
*   2 <= JSON.stringify(obj).length <= 10⁶