# Largest Number At Least Twice of Others

In this lab, you are supposed to implement a function called `dominantIndex`

that takes an integer array `nums`

as input, where the largest integer is **unique**. Your task is to determine whether the largest element in the array is **at least twice** as much as every other number in the array. If it is, return the **index** of the largest element, or return `-1`

otherwise.

Please follow the given rules carefully and make sure to export the necessary functions, variables, or any other items necessary for the evaluation script.

## Function Signature

`/** * @param {number[]} nums * @return {number} */ const dominantIndex = (nums) => { // Your implementation goes here };`

## Example

### Example 1

**Input:** nums = [3, 6, 1, 0]

**Output:** 1

**Explanation:** 6 is the largest integer. For every other number in the array x, 6 is at least twice as big as x. The index of value 6 is 1, so we return 1.

### Example 2

**Input:** nums = [1, 2, 3, 4]

**Output:** -1

**Explanation:** 4 is less than twice the value of 3, so we return -1.

### Example 3

**Input:** nums = [0, 0, 3, 1]

**Output:** 2

**Explanation:** 3 is the largest integer. For every other number in the array x, 3 is at least twice as big as x. The index of value 3 is 2, so we return 2.

## Constraints:

`2 <= nums.length <= 50`

`0 <= nums[i] <= 100`

- The largest element in
`nums`

is unique.