letterPositions.js

// FUNCTION IMPLEMENTATION
const letterPositions = function(sentence) {
  const results = {};
  for (let i = 0; i < sentence.length; i++) {
    if (sentence[i] !== ' ') {
      if (!results[sentence[i]]) {
        results[sentence[i]] = [i];
      } else {
        results[sentence[i]].push(i);
      }
    }
  }
  return results;
};

module.exports = letterPositions;

/* Test Code
const assertArraysEqual = function(actual, expected) {
  if (eqArrays(actual, expected)) {
    console.log(`✅✅✅ Assertion Passed: '${actual}' === '${expected}'`);
  } else {
    console.log(`🛑🛑🛑 Assertion Failed: '${actual}' !== '${expected}'`);
  }
};

const eqArrays = function(arrayOne, arrayTwo) {
  if (arrayOne.length === arrayTwo.length) {
    for (let i = 0; i < arrayOne.length; i++) {
      if (arrayOne[i] !== arrayTwo[i]) {
        return false;
      }
    }
  }
  if (arrayOne.length !== arrayTwo.length) {
    return false;
  }
  return true;
};

let lighthouse = "lighthouse in the house";
let result = letterPositions(lighthouse);
assertArraysEqual(result.h, [3, 5, 15, 18]);
assertArraysEqual(result.l, [0]);
*/