编辑代码

var removeDuplicates = function (nums) {
    let map = new Map()
    for (let i = 0; i < nums.length; i++) {

        if (map.get(nums[i])) {
            nums.splice(i, 1)
            --i
        }

        map.set(nums[i], true)

    }
    console.log(nums)
    console.log(map)
    console.log(map.size)
    return map.size

};

removeDuplicates([0, 0, 1, 1, 1, 2, 2, 3, 3, 4])