exercise to calculate the amount of US coins, based on a given amount of money

making-change.js

/**
 * Making Change Exercise
 *
 * Given an amount of money in USD, calculate the least number of
 * coins needed to create the given amount of money.
 *
 * Example:
 *
 * Input: $1.67
 *
 * { quarters: 6, dimes: 1, nickels: 1, pennies: 2 }
 */

 function currencyToCoins(amount) {
  let n = amount * 100

  const coins = { quarters: 0, dimes: 0, nickels: 0, pennies: 0 }
  const currencyValue = {
    quarters: 25,
    dimes: 10,
    nickels: 5,
    pennies: 1
  }

  Object.entries(currencyValue).forEach(([type, value]) => {
    coins[type] = parseInt(n / value)
    n -= coins[type] * value
  })

  return coins
 }

 console.log(currencyToCoins(1.67)) // { quarters: 6, dimes: 1, nickels: 1, pennies: 2 }