Compact

Requirements

• Implement compact(array), returning a new array with all falsy values removed.
• Remove false, zero (including negative zero and zero BigInt), empty strings, null, undefined, and NaN.
• Keep truthy values such as nonempty strings, empty arrays, objects, functions, and symbols. Preserve order, duplicates, and object references.
• Do not mutate the input. Sparse slots act like missing undefined values and are omitted.

Examples

Input: compact([0, 1, false, 2, "", 3, null])
Output: [1, 2, 3]