如何在不创建新数组时从对象数组中筛选符合多条件的最优士兵？

Alright, let's figure out how to solve this without creating a new array—super straightforward once you break it down. Here's a step-by-step approach with code to match your soldier data:

We don't need to copy values into a new array at all. Instead, we'll just iterate through the original soldiers array directly, keeping track of the best candidate as we go:

• Start with a variable to hold the current best soldier (initially null).
• Loop through each soldier in the original array.
• First, skip any soldier that doesn't meet your baseline condition (like combat >= 60).
• Compare the current soldier to the stored "best" one using your multi-attribute rules, updating the best soldier whenever we find a better match.

Since your data is structured as an array of objects, here's a concrete implementation using your exact soldier data:

// Your original soldier array
const soldiers = [
  {name: 'John', shooting: 95, combat: 50, tactic: 88},
  {name: 'Arnold', shooting: 97, combat: 72, tactic: 68},
  {name: 'William', shooting: 87, combat: 86, tactic: 97}
];

// Variable to track our best soldier (no new array needed!)
let bestSoldier = null;

// Iterate directly over the original array
for (const soldier of soldiers) {
  // Step 1: Skip anyone who fails the baseline combat requirement
  if (soldier.combat < 60) {
    continue;
  }

  // If we haven't picked a best soldier yet, set this one
  if (!bestSoldier) {
    bestSoldier = soldier;
    continue;
  }

  // Step 2: Multi-attribute comparison (customize these rules to fit your needs!)
  // Here we'll use priority: tactic > shooting > combat
  if (soldier.tactic > bestSoldier.tactic) {
    bestSoldier = soldier;
  } else if (soldier.tactic === bestSoldier.tactic) {
    // If tactics are tied, check shooting
    if (soldier.shooting > bestSoldier.shooting) {
      bestSoldier = soldier;
    } else if (soldier.shooting === bestSoldier.shooting) {
      // If shooting is tied, check combat
      if (soldier.combat > bestSoldier.combat) {
        bestSoldier = soldier;
      }
    }
  }
}

// Get the result
const result = bestSoldier ? bestSoldier.name : "No soldiers meet the criteria";
console.log(result); // Outputs: William

You can tweak the comparison logic to fit any multi-attribute criteria you need:

• If your rule is "combat >=60 AND shooting + tactic >= 160", add that check before comparing attributes.
• If you need to return multiple top soldiers (e.g., two with the same highest tactic score), you can switch bestSoldier to a small array (though this is technically a new array, it's minimal and still avoids copying the entire soldier dataset).
• Adjust the priority order (e.g., make combat the top priority instead of tactic) by reordering the comparison checks.

内容的提问来源于stack exchange，提问作者Vontar