290. 单词规律

/**
 * @param {string} pattern
 * @param {string} s
 * @return {boolean}
 */
var wordPattern = function (pattern, s) {
  let map = new Map()
  let patternArr = pattern.split('')
  let arr = s.split(' ')
  if (patternArr.length !== arr.length || new Set(patternArr).size !== new Set(arr).size) {
    return false
  }
  for (let i = 0; i < patternArr.length; i++) {
    if (map.has(patternArr[i])) {
      if (map.get(patternArr[i]) !== arr[i]) {
        return false
      }
    } else {
      map.set(patternArr[i], arr[i])
    }
  }
  return true
}