taxes.js

/*
  
# taxes.js - calculate Federal Taxes

## Usage:

taxes.bracket(0, 22000, 0.10)
taxes.bracket(22001, 89450, 0.12);
taxes.bracket(89451, 190750, 0.22);

taxes.income(100000);

console.log("Total Taxes: ", taxes.calculate());
console.log("Taxes Per Bracket: ", taxes.calculatePerBraket());

*/

const taxes = {
  brackets: [],
  income: 0,

  // Method to add a tax bracket
  bracket: function(min, max, rate) {
    this.brackets.push({ min, max, rate });
  },

  // Method to set the income
  income: function(amount) {
    this.income = amount;
  },

  // Method to calculate total expected taxes
  calculate: function() {
    let totalTax = 0;
    for (const bracket of this.brackets) {
      if (this.income > bracket.min) {
        const taxableIncome = Math.min(this.income, bracket.max) - bracket.min;
        totalTax += taxableIncome * bracket.rate;
      }
    }
    return totalTax;
  },

  // Method to calculate taxes per bracket
  calculatePerBraket: function() {
    let taxesPerBracket = [];
    for (const bracket of this.brackets) {
      if (this.income > bracket.min) {
        const taxableIncome = Math.min(this.income, bracket.max) - bracket.min;
        const tax = taxableIncome * bracket.rate;
        taxesPerBracket.push({
          range: `${bracket.min}-${bracket.max}`,
          rate: bracket.rate,
          tax: tax
        });
      }
    }
    return taxesPerBracket;
  }
};

// Usage
taxes.bracket(0, 22000, 0.10)
taxes.bracket(22001, 89450, 0.12);
taxes.bracket(89451, 190750, 0.22);

taxes.income(100000);

console.log("Total Taxes: ", taxes.calculate());
console.log("Taxes Per Bracket: ", taxes.calculatePerBraket());