Question

Write a function that extracts all numbers from the given nested list?
function solve( a ){ //write your code here }
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Input: [1, 2, [3, 4]]
Output: [1, 2, 3, 4]

Input: [[1, 2], 3, 4]
Output: [1, 2, 3, 4]

Input: [1, [2, [3, 4]]]
Output: [1, 2, 3, 4]