69. Sqrt(x)

Description:

Implement int sqrt(int x).

Compute and return the square root of x.

x is guaranteed to be a non-negative integer.

Example 1:

Input: 4
Output: 2

Example 2:

Input: 8
Output: 2
Explanation: The square root of 8 is 2.82842..., and since we want to return an integer, the decimal part will be truncated.

My code:

/**
 * @param {number} x
 * @return {number}
 */
var mySqrt = function(x) {
    if(x == 0 || x == 1) {
        return x;
    }
    for(let i = 1; i < x ; i++) {
        if(i * i == x) {
            return i;
        } else if ((i + 1) * (i + 1) > x) {
            return i;
        }
    }
};