Product of array except self

function productExceptSelf(nums: number[]): number[] {
    const postfix = [];
    const indexLast = nums.length - 1;
    postfix[indexLast] = nums[indexLast];
    for (let i = indexLast - 1; i >= 0; i--) {
        postfix[i] = postfix[i+1] * nums[i];
    }
    const result = [postfix[1]];
    let prefix = nums[0];
    for (let i = 1; i < indexLast; i++) {
        result[i] = prefix * postfix[i+1];
        prefix *= nums[i]
    }
    result[indexLast] = prefix;
    return result;
};