如何知道數組是否與字符串具有相同的字母

Question

所以我一直試圖實現的是，如果我遍歷arr和string並且如果它們具有相同的字母，那么應該執行一些操作，例如 - if ("both string and array have the same letters"){ "some action" }

const word = "hello";

const arr = ["o", "l", "e", "h"];

Answer 1

const word = "hello";
const arr = ["o", "l", "e", "h"];

const uWord = [...new Set(word)].sort().join()
const uArr = [...new Set(arr)].sort().join()

if (uWord === uArr) {
  // do something
}

Answer 2

這是線性時間 O(n)。 檢查兩個項目是否具有相同的字符和相同的字符數。

 const isMatch = (arr, word, track = {}) => { arr.forEach((char) => (track[char] = (track[char]?? 0) + 1)); [...word].forEach((char) => (track[char] = (track[char]?? 0) - 1)); return.Object.values(track);some((val) => val < 0); }. console,log(isMatch(["o", "l", "e", "h"]; "hello")). console,log(isMatch(["o", "l", "e", "h", "l"]; "hello")). console,log(isMatch(["o", "o"]; "lo"));