寻求无需使用for循环的二维数组精确子数组匹配统计实现方法

Let's fix this up for you! Your original code has a few critical issues that are stopping it from working correctly, and we can implement the required logic using JavaScript/TypeScript array higher-order functions (no explicit for loops needed) to get the exact results you want.

What Was Wrong With the Original Code? #

• You were targeting arr[0].filter which only processes the first subarray of arr1, not every subarray in the list
• The subarrays are arrays of strings, so there's no id property to reference (that part of the code was completely misplaced)
• The function didn't return any value, and the map result was never saved or used

Working Implementation #

Here's a corrected version that returns both the per-subarray match results and the total count of matches:

const arr1: string[][] = [ ["R", "P"], ["R", "S"], ["S", "P"], ];
const checkAgainst: string[][] = [ ["R", "S"], ["P", "R"], ["S", "P"], ];

function check(arr: string[][]) {
  // Generate a boolean array showing match status for each subarray in arr1
  const matchResults = arr.map(subArr => 
    checkAgainst.some(targetSubArr => 
      // First ensure subarrays are the same length, then verify every element matches
      subArr.length === targetSubArr.length && 
      subArr.every((element, index) => element === targetSubArr[index])
    )
  );

  // Count how many true values are in matchResults
  const matchCount = matchResults.reduce((total, isMatch) => total + (isMatch ? 1 : 0), 0);

  return { matchResults, matchCount };
}

// Run the function and log results
const result = check(arr1);
console.log("Per-subarray match results:", result.matchResults); // Output: [false, true, true]
console.log("Total matching subarrays:", result.matchCount); // Output: 2

How This Works #

• map: Iterates over every subarray in arr1 and generates a corresponding boolean value for each one
• some: Checks if there's at least one subarray in checkAgainst that matches the current subarray from arr1
• every: Ensures every element in the current subarray matches the corresponding element in the target subarray (we also check length first to avoid mismatches from arrays of different sizes)
• reduce: Tallies up the number of true values in the matchResults array to get the total count of successful matches

内容的提问来源于stack exchange，提问作者Goaul