(Js) Leetcode 69. Square root of x

topic:

Implement the int sqrt(int x) function.

Calculate and return the square root of x, where x is a non-negative integer.

Since the return type is an integer, only the integer part of the result is retained, and the decimal part will be discarded.

Example 1:

Input: 4
Output: 2
Example 2:

Input: 8
Output: 2
Description: The square root of 8 is 2.82842..., 
     since the return type is an integer, the fractional part will be discarded.

Ideas:

Round down

- parseInt(Math.sqrt(x))

- (Math.sqrt(x)|0)

- (~~Math.sqrt(x))

Code:

/**
 * @param {number} x
 * @return {number}
 */
var mySqrt = function(x) {
    while(x >= 0){
        return parseInt(Math.sqrt(x));
    }
};

operation result: