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FagnerMartinsBrack/interestToPayForAfterYouRemoveDuplication.js

Created November 22, 2018 10:35
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(Medium) - How TDD Can Prevent Over-Engineering
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interestToPayForAfterYouRemoveDuplication.js
const interestToPayFor = (loanAmount) => {
const greaterThan2000 = { endOfRange: Money('$2000.00'), interestPerDollar: Money('$0.09'), previousInterestPerDollar: Money('$0.00') };
const greaterThan5000 = { endOfRange: Money('$5000.00'), interestPerDollar: Money('$0.14'), previousInterestPerDollar: Money('$0.09') };
const greaterThan10000 = { endOfRange: Money('$10000.00'), interestPerDollar: Money('$0.21'), previousInterestPerDollar: Money('$0.14') };
if (loanAmount.greaterThan(Money('$2000.00')) && loanAmount.lessThan(Money('$5001.00'))) {
let interestAmount = Money('$0.00');
interestAmount = interestAmount.plus(calculateInterest(loanAmount, greaterThan2000));
return interestAmount;
}
if (loanAmount.greaterThan(Money('$5000.00')) && loanAmount.lessThan(Money('$10001.00'))) {
let interestAmount = Money('$0.00');
interestAmount = interestAmount.plus(calculateInterest(loanAmount, greaterThan2000));
interestAmount = interestAmount.plus(calculateInterest(loanAmount, greaterThan5000));
return interestAmount;
}
if (loanAmount.greaterThan(Money('$10000.00'))) {
let interestAmount = Money('$0.00');
interestAmount = interestAmount.plus(calculateInterest(loanAmount, greaterThan2000));
interestAmount = interestAmount.plus(calculateInterest(loanAmount, greaterThan5000));
interestAmount = interestAmount.plus(calculateInterest(loanAmount, greaterThan10000));
return interestAmount;
}
return Money('$0.00');
};
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