broken-calculator.js

/* Broken Calculator
There is a broken calculator that has the integer startValue on its display initially.
In one operation, you can:

multiply the number on display by 2, or
subtract 1 from the number on display.

Given two integers startValue and target, 
return the minimum number of operations needed to display target on the calculator.

Example 1:
Input: startValue = 2, target = 3
Output: 2
Explanation: Use double operation and then decrement operation {2 -> 4 -> 3}.

Example 2:
Input: startValue = 5, target = 8
Output: 2
Explanation: Use decrement and then double {5 -> 4 -> 8}.

Example 3:
Input: startValue = 3, target = 10
Output: 3
Explanation: Use double, decrement and double {3 -> 6 -> 5 -> 10}.
*/

/**
 * @param {number} startValue
 * @param {number} target
 * @return {number}
 */
 var brokenCalc = function(startValue, target) {

    let counter = 0;
    if(startValue >= target){
        return startValue - target;
    }

    while(startValue < target){
        if(target % 2 === 0){
            target /= 2;
        }else {
            target += 1;
        }
        counter++;
    }
    
    return counter + (startValue - target);
};