Javascript puzzle (I'm stuck)

1

Hey Everyone,

I am new to Javascript and have been banging my head against the wall for a few hours on this one. Below are the parameters of the problem and my current solution.

Parameters:

You put 1000 dollars into a new cryptocurrency. Good luck! Over ten years, the value of the investment increases by 5% each year. In the seventh year, the investment loses 75% instead of increasing. Eeek! Use a for loop to log how many years it has been and how much the investment is worth for each year.

Solution (so far):

let investment = 1000;

for (var year = 1; year <= 10; year++){
  investment = investment + investment * 0.05;
 console.log("In year " + year + " your investment was worth " + "$" + investment);
}

I have figured out how to increase the value of the investment by 5% each year, but I can’t figure out how to make it drop by 75% in year 7.

Please help point me in the right direction. Thank you for your help :).

-Buddha Blake

3

Thank you for the pointer, I think I found a solution.

let investment = 1000;


for (var year = 1; year <= 10; year++){
  if(year === 7){
    investment = investment * .25;
  }
  else{
  investment = investment + investment * 0.05;
  };
  console.log("In year " + year + " your investment was worth " + "$" + investment);
}

How does that look? It gives me the result I’m looking for, but does it follow best practices?

4

If it achieves your goal, that is what is important. You could do something similar like the following to shorten your code a bit. It uses the ternary operator.

let investment = 1000;

for (var year = 1; year <= 10; year++){
  var percentChange = year === 7 ? 0.25 : 1.05;
  investment *= percentChange;
  console.log("In year " + year + " your investment was worth " + "$" + investment);
}
5

Nice! I had no idea the ternary operator even existed. Thanks, @camperextraordinaire.

-Buddha Blake