## 1822. Sign of the Product of an Array

There is a function `signFunc(x)` that returns:

• `1` if `x` is positive.
• `-1` if `x` is negative.
• `0` if `x` is equal to `0`.

You are given an integer array `nums`. Let `product` be the product of all values in the array `nums`.

Return `signFunc(product)`.

Example 1:

```Input: nums = [-1,-2,-3,-4,3,2,1]
Output: 1
Explanation: The product of all values in the array is 144, and signFunc(144) = 1
```

Example 2:

```Input: nums = [1,5,0,2,-3]
Output: 0
Explanation: The product of all values in the array is 0, and signFunc(0) = 0
```

Example 3:

```Input: nums = [-1,1,-1,1,-1]
Output: -1
Explanation: The product of all values in the array is -1, and signFunc(-1) = -1
```

Constraints:

• `1 <= nums.length <= 1000`
• `-100 <= nums[i] <= 100`

## Rust Solution

``````struct Solution;

impl Solution {
fn array_sign(nums: Vec<i32>) -> i32 {
nums.into_iter().map(|x| x.signum()).product()
}
}

#[test]
fn test() {
let nums = vec![-1, -2, -3, -4, 3, 2, 1];
let res = 1;
assert_eq!(Solution::array_sign(nums), res);
let nums = vec![1, 5, 0, 2, -3];
let res = 0;
assert_eq!(Solution::array_sign(nums), res);
let nums = vec![-1, 1, -1, 1, -1];
let res = -1;
assert_eq!(Solution::array_sign(nums), res);
}
``````

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