Backspace String Compare LeetCode solution in JavaScript

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var backspaceCompare = function (s, t) {
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  let stack1 = [];
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  let stack2 = [];
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  for (let i = 0; i < s.length; i++) {
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    if (s[i] == "#") {
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      if (stack1.length != 0) {
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        stack1.pop();
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      }
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    } else {
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      stack1.push(s[i]);
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    }
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  }
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  for (let j = 0; j < t.length; j++) {
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    if (t[j] == "#") {
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      if (stack2.length != 0) {
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        stack2.pop();
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      }
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    } else {
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      stack2.push(t[j]);
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    }
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  }
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  return stack1.join("") === stack2.join("");
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};