31 posts tagged with "string"

/**
 * @param {number} n
 * @return {string[]}
 */
var fizzBuzz = function (n) {
  const result = [];

  for (let i = 1; i <= n; i++) {
    if (i % 15 === 0) {
      result.push('FizzBuzz');
    } else if (i % 5 === 0) {
      result.push('Buzz');
    } else if (i % 3 === 0) {
      result.push('Fizz');
    } else {
      result.push(i.toString());
    }
  }

  return result;
};

/**
 * @param {string} s
 * @return {number}
 */
var countSegments = function (s) {
  if (s.length === 0) {
    return 0;
  }

  let result = s[0] !== ' ' ? 1 : 0;

  for (let i = 0; i < s.length; i++) {
    if (s[i - 1] === ' ' && s[i] !== ' ') {
      result++;
    }
  }

  return result;
};

/**
 * @param {string} s
 * @return {boolean}
 */
var repeatedSubstringPattern = function (s) {
  // s를 두 번 반복한 후, 첫 글자, 맨 마지막 글자를 제거한 후 그 안에 s가 들어있는지 판별
  return s.repeat(2).slice(1, -1).includes(s);
};

/**
 * @param {string[]} words
 * @return {string[]}
 */
var findWords = function (words) {
  const firstRow = 'qwertyuiop';
  const secondRow = 'asdfghjkl';
  const thirdRow = 'zxcvbnm';

  const result = [];

  for (const word of words) {
    const lowerCaseWord = word.toLocaleLowerCase();
    const a = lowerCaseWord.split('').every((word) => firstRow.includes(word));
    const b = lowerCaseWord.split('').every((word) => secondRow.includes(word));
    const c = lowerCaseWord.split('').every((word) => thirdRow.includes(word));

    if (a || b || c) {
      result.push(word);
    }
  }

  return result;
};

/**
 * @param {string} word
 * @return {boolean}
 */
var detectCapitalUse = function (word) {
  if (word.length === 1) {
    return true;
  }

  const isAllLowerCase = (word) => {
    return word.charCodeAt(0) >= 97 && word.charCodeAt(0) <= 122;
  };
  const isAllUpperCase = (word) => {
    return word.charCodeAt(0) >= 65 && word.charCodeAt(0) <= 90;
  };

  if (isAllLowerCase(word[0])) {
    for (let i = 0; i < word.length; i++) {
      if (!isAllLowerCase(word[i])) {
        return false;
      }
    }
  } else {
    if (isAllLowerCase(word[1])) {
      for (let i = 1; i < word.length; i++) {
        if (!isAllLowerCase(word[i])) {
          return false;
        }
      }
    } else {
      for (let i = 0; i < word.length; i++) {
        if (!isAllUpperCase(word[i])) {
          return false;
        }
      }
    }
  }
  return true;
};

/**
 * @param {string} s
 * @return {boolean}
 */
var isPalindrome = function (s) {
  const lowerCaseString = s.toLowerCase();
  let onlyLowerCase = '';

  for (let i = 0; i < lowerCaseString.length; i++) {
    const regex = /^[a-z0-9]/;
    if (regex.test(lowerCaseString[i])) {
      onlyLowerCase += lowerCaseString[i];
    }
  }

  let reverseOnlyLowerCase = '';

  for (let j = onlyLowerCase.length - 1; j >= 0; j--) {
    reverseOnlyLowerCase += onlyLowerCase[j];
  }

  console.log(onlyLowerCase, reverseOnlyLowerCase);

  return onlyLowerCase === reverseOnlyLowerCase;
};

/**
 * @param {string} s
 * @return {number}
 */
var romanToInt = function (s) {
  let total = 0;

  for (let i = 0; i < s.length; i++) {
    if (values[s[i]] < values[s[i + 1]]) {
      total += values[s[i + 1]] - values[s[i]];
      i++;
    } else {
      total += values[s[i]];
    }
  }
  return total;
};

const values = {
  I: 1,
  V: 5,
  X: 10,
  L: 50,
  C: 100,
  D: 500,
  M: 1000,
};

/**
 * @param {string[]} strs
 * @return {string}
 */
var longestCommonPrefix = function (strs) {
  if (strs.length === 1) {
    return strs[0];
  }

  const [baseWord, ...rest] = strs;

  for (let i = 0; i <= baseWord.length; i++) {
    for (let j = 0; j < strs.length; j++) {
      if (baseWord[i] !== strs[j][i]) {
        return baseWord.slice(0, i);
      }
    }
  }

  return baseWord;
};

/**
 * @param {string[]} strs
 * @return {string}
 */
var longestCommonPrefix = function (strs) {
  if (!strs.length) {
    return '';
  }

  for (let i = 0; i <= strs[0].length; i++) {
    if (!strs.every((string) => string[i] === strs[0][i])) {
      return strs[0].slice(0, i);
    }
  }

  return strs[0];
};

/**
 * @param {number} columnNumber
 * @return {string}
 */
var convertToTitle = function (columnNumber) {
  // String.fromCharCode(65) === "A"
  // 한 자릿수일 경우
  if (columnNumber - 1 < 26) {
    return String.fromCharCode(65 + ((columnNumber - 1) % 26));
  }

  // 두 자릿수 이상일 경우
  let result = '';
  while (columnNumber > 0) {
    const remainder = (columnNumber - 1) % 26;
    const remainderCharCode = String.fromCharCode(65 + remainder);
    result = remainderCharCode + result;
    columnNumber = parseInt((columnNumber - 1) / 26);
  }
  return result;
};

/**
 * @param {string} columnTitle
 * @return {number}
 */
var titleToNumber = function (columnTitle) {
  if (columnTitle.length === 1) {
    return (columnTitle.charCodeAt(0) % 65) + 1;
  }

  let result = 0;

  for (let i = columnTitle.length - 1; i >= 0; i--) {
    const strCode = (columnTitle[i].charCodeAt(0) % 65) + 1;
    if (i === columnTitle.length - 1) {
      result += strCode;
    } else {
      result += strCode * 26 ** (columnTitle.length - i - 1);
    }
  }
  return result;
};