Day 2- DepositProfit.js

/*Deposit Profit 

https://scrimba.com/scrim/coab9473f84df5ee10899e99d

DESCRIPTION: 
You have deposited a specific amount of dollars into your ban account. 
Each year your balance increases at the same growth rate.
Found out how long it would take for yout balance to pass a specific threshold with the assumption that you don't make any additional deposits.

Example:

For deposit = 100, rate = 20, and threshold = 170, the output should be the depositProfit(deposit, rate, threshold) = 3.

Each year the amount of money on your account increases by 20%. It means that throughout the years your balance would be:

year 0: 100;
year 1: 120;
year 2: 144;
 year 2: 172,8

Thus, it will take 3 years for your balance to pass the threshold, which is the answer.
*/


const depositProfit = (deposit, rate, threshold) => {
    
    let money = deposit
    let year = 0
    
    while (money < threshold) {
        money = (money+(money/100)*rate)
        year++
    }
        
    return year  
}


/**
* Test Suite 
*/
describe('depositProfit()', () => {
    it('returns number of years it will take to hit threshold based off of deposit & rate', () => {
        // arrange
        const deposit = 100;
        const rate = 20;
        const threshold = 170;
        
        // act
        const result = depositProfit(deposit, rate, threshold)

        // log
        console.log("result: ", result);
        
        // assert
        expect(result).toBe(3);
    });
});