find median of two sorted array

Question

Given two sorted array of integers, please return the median.

median([1,2],[3,4,5])
// 3

If there are even numbers, return the average.

median([1,2],[3,4])
// 2.5

follow-up

What is the time & space cost of your approach? Could you do better?

Code

/**
 * @param {number[]} arr1 - sorted integer array
 * @param {number[]} arr2 - sorted integer array
 * @returns {number}
 */
function median(arr1, arr2) {
  // your code here
}

Source

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