Telegram Exercise

leetcode.js

function compareArray(a, b) {
  // check if arrays, check length, check index match
  return Array.isArray(a) && 
  	Array.isArray(b) && 
    a.length === b.length && 
    a.every((val, index) => val === b[index]);
}

function wrapText(words, maxLength) {
  const result = [];
  let row = [];
  // iterate through each word
  words.forEach(word => {
    // check length, if > maxLength add row and reset
    if (row.join(' ').length + word.length >= maxLength) {
        result.push(row.join(' '));
        // add word into array
        row = [word];
    } else {
    	// add word to row if < maxLength
      row.push(word);
    }
  });
  
  // once row length is > 0
  if (row.length > 0) {
      result.push(row.join(' '));
  }
  return result;
}


// output
function runTestCase({words, maxLength, expected}) {
	const result = wrapText(words, maxLength)
  const compare = compareArray(result, expected)
  // didn't know this existed :D 
  console.assert(compare, 'AssertionError')
  console.log('test case result:', compare ? result : [])
}

        
// My fake Test Case
const testCases = [
  {
    words: [
      "The",
      "task",
      "is",
      "to",
      "write",
      "a",
      "program",
      "which",
      "accepts",
      "lines",
      "of",
      "text",
      "and",
      "generates",
      "output",
      "lines",
      "of",
      "a",
      "different",
      "length,",
      "without",
      "splitting",
      "any",
      "of",
      "the",
      "words",
      "in",
      "the",
      "text.",
      "We",
      "assume",
      "no",
      "word",
      "is",
      "longer",
      "than",
      "the",
      "size",
      "of",
      "the",
      "output",
      "lines.",
    ],
    maxLength: 40,
    expected: [
      "The task is to write a program which",
      "accepts lines of text and generates",
      "output lines of a different length,",
      "without splitting any of the words in",
      "the text. We assume no word is longer",
      "than the size of the output lines.",
    ]
 },
 {
  words: [
    "The",
    "Pacific",
    "Ocean",
    "is",
    "the",
    "largest",
    "and",
    "deepest",
    "of",
    "Earth's",
    "oceanic",
    "divisions.",
    "It",
    "extends",
    "from",
    "the",
    "Arctic",
    "Ocean",
    "in",
    "the",
    "north",
    "to",
    "the",
    "Southern",
    "Ocean",
    "in",
    "the",
    "south.",
  ],
  maxLength: 11,
  expected: [
    "The Pacific",
    "Ocean is",
    "the largest",
    "and deepest",
    "of Earth's",
    "oceanic",
    "divisions.",
    "It extends",
    "from the",
    "Arctic",
    "Ocean in",
    "the north",
    "to the",
    "Southern",
    "Ocean in",
    "the south.",    
  ]
 }
]
// Run test cases
testCases.forEach(({words, maxLength, expected}) => runTestCase({words, maxLength, expected}))