500. 键盘行

/**
 * @param {string[]} words
 * @return {string[]}
 */
var findWords = function (words) {
  let result = []
  const lines = ['qwertyuiop', 'asdfghjkl', 'zxcvbnm']
  words.forEach((word) => {
    const item = word.toLowerCase()
    let charLine = ''
    const flag = item.split('').every((char) => {
      if (charLine === '') {
        if (lines[0].includes(char)) {
          charLine = lines[0]
        } else if (lines[1].includes(char)) {
          charLine = lines[1]
        } else if (lines[2].includes(char)) {
          charLine = lines[2]
        }
        return true
      } else {
        return charLine.includes(char)
      }
    })
    if (flag) {
      result.push(word)
    }
  })
  return result
}