Cassidoo #320

cassidoo320.js

/**
 * https://buttondown.email/cassidoo/archive/perseverance-is-failing-19-times-and-succeeding/
 * 
 * Given two integers source and target,
 * add operators in the source number to make it equal target, if possible.
 * You can return just one, or all possibilities for this!
 *
 * Example:
 * > addOperators(123, 6)
 * > ["1*2*3", "1+2+3"]
 *
 * > addOperators(3456237490, 9191)
 * > [] // none possible
 */
var addOperators = function (source, target) {
  if (source === target) {
    return 'The source and target values are equal.'
  }

  // split the source into individual pieces,
  // then find the sum total for all the individual integers within source
  var sourceStringArray = source.toString().split("");
  var sourceAdditionTotal = sourceStringArray.reduce(function (acc, curr) { return acc + Number(curr); }, 0);

  // find the multiplication total for all the individual integers within source
  var sourceMultiplicationTotal = sourceStringArray.reduce(function (acc, curr) { return acc * Number(curr); }, 1);

  var result = [];

  if (sourceAdditionTotal === target) {
    result.push(sourceStringArray.join('+'));
  }
  if (sourceMultiplicationTotal === target) {
    result.push(sourceStringArray.join("*"));
  }

  return result;
};

console.log(addOperators(123, 6)); // [ '1+2+3', '1*2*3' ]
console.log(addOperators(3456237490, 9191)); // []
console.log(addOperators(1, 9)); // []
console.log(addOperators(0, 0)); // The source and target values are equal.
console.log(addOperators(123, -6)); // []
console.log(addOperators(234, 24)); // [ '2*3*4' ]
console.log(addOperators(234, 9)); // [ '2+3+4' ]