minimum-value-finished.js

// Option 1: Math.min()
const findSmallestIntUsingMathMin = args => {
  return Math.min(...args);
};

console.log(findSmallestIntUsingMathMin([1, 2, 3, 4, 0, 5]));

// Option 2: Array.reduce()
const reducer = (minValue, currentValue) =>
  minValue < currentValue ? minValue : currentValue;

const findSmallestIntUsingReduce = args => {
  return args.reduce(reducer);
};

console.log(findSmallestIntUsingReduce([1, 2, -3, 4, 5]));

minimum-value.js

const findSmallestIntUsingMathMin = args => {
  return Math.min(...args)
};

const findSmallestInt = args => {
  return args.sort((a,b) => a - b)[0]
};



console.log(findSmallestInt([1, 2, 3, 4, -10, 5]));

roman-numerals-finished.js

// Martin's preferred solution:
function romanize(num) {
  const romanMatrix = {
    M: 1000,
    CM: 900,
    D: 500,
    CD: 400,
    C: 100,
    XC: 90,
    L: 50,
    XL: 40,
    X: 10,
    IX: 9,
    V: 5,
    IV: 4,
    I: 1
  };

  let roman = "";

  for (let key of Object.keys(romanMatrix)) {
    const quotient = Math.floor(num / romanMatrix[key]);
    num -= quotient * romanMatrix[key];
    roman += key.repeat(quotient);
  }

  return roman;
}

console.log(romanize(1234));

// Top StackOverflow Solution:
function romanize (num) {
  if (isNaN(num))
      return NaN;
  var digits = String(+num).split(""),
      key = ["","C","CC","CCC","CD","D","DC","DCC","DCCC","CM",
             "","X","XX","XXX","XL","L","LX","LXX","LXXX","XC",
             "","I","II","III","IV","V","VI","VII","VIII","IX"],
      roman = "",
      i = 3;
  while (i--)
      roman = (key[+digits.pop() + (i * 10)] || "") + roman;
  return Array(+digits.join("") + 1).join("M") + roman;
}

// Second StackOverFlow Solution:
function romanize(num) {
  var lookup = {M:1000,CM:900,D:500,CD:400,C:100,XC:90,L:50,XL:40,X:10,IX:9,V:5,IV:4,I:1},roman = '',i;
  for ( i in lookup ) {
    while ( num >= lookup[i] ) {
      roman += i;
      num -= lookup[i];
    }
  }
  return roman;
}

roman-numerals.js

function romanize(num) {
  const lookup = {
    M: 1000,
    CM: 900,
    D: 500,
    CD: 400,
    C: 100,
    XC: 90,
    L: 50,
    XL: 40,
    X: 10,
    IX: 9,
    V: 5,
    IV: 4,
    I: 1
  };
}

console.log(romanize(123));