index.js

let Formulas = {};

Formulas.add = function (a, b) {
  return a + b;
}

Formulas.divideMultiply = function (a, b) {
  if (b == 0) {
    return undefined;
  }
  return a * a / b;
}

Formulas.roundNumbers = function (a) {
  return Math.round(a);
}

Formulas.sinTimesCos = function (a) {
  return Math.sin(a) * Math.cos(a);
}

Formulas.parseNumberFromString = function (a) {
  return parseFloat(a);
}

Formulas.findObjectValueByKey = function (obj, key) {
  let i;
  let j;
  let p;
  
  for (i = 0; i < Object.keys(obj).length; i++) {
    if (Object.keys(obj)[i] === key) {
      return Object.values(obj)[i];
    }
    if (typeof Object.values(obj)[i] === "object" && (Object.values(obj)[i] !== null)) {
      var newObject = Object.values(obj)[i];
      for (j = 0; j < Object.keys(newObject).length; j++) {
        if (Object.keys(newObject)[j] === key) {
          return Object.values(newObject)[j];
        }
        if (typeof Object.values(newObject)[j] === "object" && (Object.values(newObject)[j] !== null)) {
          var newObject2 = Object.values(newObject)[j];
          for (p = 0; p < Object.keys(newObject2).length; p++) {
            if (Object.keys(newObject2)[p] === key) {
              return Object.values(newObject2)[p];
            }
          }
        }
      }
    }
  }
}

Formulas.parseJSON = function (a) {
  return JSON.parse(a);
}

Formulas.pushToArray = function (a, b) {
  return a.push(b);
}

Formulas.squareArrayValues = function (a) {
  var newArr = a;
  for (var i = 0; i < newArr.length; i++) {
    newArr[i] = newArr[i] * newArr[i];
  }
  return a;
}

Formulas.sortArray = function (a) {
  return a.sort(Formulas.sortNumbers)
}

Formulas.sortNumbers = function (a, b) {
  return a - b;
}

Formulas.reverseString = function (a) {
  var newString = "";
  for (var i = a.length - 1; i >= 0; i--) {
    newString += a[i];
  }
  return newString;
}

module.exports = Formulas;