javascript - 将困惑数组与字符串匹配的函数

Question

有谁知道我如何将一堆困惑的字母与一个单词匹配，例如，一些匹配的函数一个数组，例如 ["a","c","a","e","c"]；给一个词“ace”并给我 1 或者如果不是 -1 就像 indexOf 或 InArray 但对于一个困惑的词。我用一个有据可查的例子制作了一个 js fiddle

请注意，我会将字母数组与 30000 - 50000 个单词的任意位置进行比较。

https://jsfiddle.net/AlexanderMitrakis/89dchpt8/1/

this.gameletters = []; //Array of Game letters. 
                //e.g. ["P", "E", "H", "E", "U", "I", "S", "Q", "N"];


this.possiblesolution = new String(); //highest solution within gameletters
                //e.g. "QUEENSHIP" (related to above letters) 

this.wordBank = new Array(); 
               //array of arrays structure is formated around alphabet with an array for each character:
               /* 
                a: Array(7295)
                b:Array(7271)
                c:Array(11381)
                d:Array(7216)
                ... 
                y:Array(607)
                z:Array(623)
               */

Answer 1

递归策略是一个简单的解决方案，但如果你的 gameletters 数组变得太大，它确实会减慢执行速度。对于像拼字游戏这样的游戏，它应该足够了。

Fiddle

var gameletters = ["P", "E", "H", "E", "U", "I", "S", "Q", "N"];
var wordbank = {
  "a": Array(3461),
  "b": Array(2391),
  //...
};

var matches = {};

function step(word, letters) {
  for(var i = 0, len = letters.length; i < len; i++) {

    var arr = letters.map(a => a);
    if (arr.length === 0) {
      return;
    }

    var letter = arr[i];
    arr.splice(i,1);
    test(word + letter);

    if (arr.length) {
      step(word + letter, arr)
    }
  }
}

function test(word) {
  var firstLetter = word.substr(0,1);
  if (wordbank[firstLetter].indexOf(word) >= 0) {
    matches[word] = 1;
  }
}

step("", gameletters);