Income tax calc

calc.ts

type Brackets = {
  min: number;
  max: number;
  rate: number;
}[];

export const calculateIncomeTax = (salary: number, brackets: Brackets) => {
  return brackets.reduce<number>((acc, b) => {
    if (salary > b.min) {
      const taxableAmount = Math.min(salary, b.max) - b.min;
      return acc + taxableAmount * b.rate;
    }
    return acc;
  }, 0);
};