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36 lines
1.6 KiB
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36 lines
1.6 KiB
HTML
<p>Given an object or array <code>obj</code>, return a <strong>compact object</strong>. A <strong>compact object</strong> is the same as the original object, except with keys containing <strong>falsy</strong> 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 <strong>falsy</strong> when <code>Boolean(value)</code> returns <code>false</code>.</p>
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<p>You may assume the <code>obj</code> is the output of <code>JSON.parse</code>. In other words, it is valid JSON.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> obj = [null, 0, false, 1]
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<strong>Output:</strong> [1]
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<strong>Explanation:</strong> All falsy values have been removed from the array.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> obj = {"a": null, "b": [false, 1]}
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<strong>Output:</strong> {"b": [1]}
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<strong>Explanation:</strong> obj["a"] and obj["b"][0] had falsy values and were removed.</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> obj = [null, 0, 5, [0], [false, 16]]
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<strong>Output:</strong> [5, [], [16]]
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<strong>Explanation:</strong> obj[0], obj[1], obj[3][0], and obj[4][0] were falsy and removed.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>obj is a valid JSON object</code></li>
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<li><code>2 <= JSON.stringify(obj).length <= 10<sup>6</sup></code></li>
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</ul>
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