Median of Two Sorted Arrays

LeetCode題目: 4. Median of Two Sorted Arrays

My solution:

/**
 * @param {number[]} nums1
 * @param {number[]} nums2
 * @return {number}
 */
let findMedianSortedArrays = (nums1, nums2) => {
    let merged = nums1.concat(nums2).sort((a, b) => a - b);
    const halfLen = merged.length/2;
    return (merged.length % 2 !== 0) ? merged[Math.round(halfLen)-1] : (merged[halfLen-1] + merged[halfLen])/2;
}