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[] (mảng rỗng) khi cộng lại thì trở thành chuỗi rỗng, vì vậy [ ] [ ] = '' '' = '', kết quả là chuỗi rỗng. [ ] === [ ] trả về False bởi vì trong JavaScript, so sánh mảng dùng phép so sánh theo địa chỉ bộ nhớ. Tức là nó so sánh kiểu như 0xfbdseur === 0xjslehrufiri, nên kết quả là False. Biểu thức [1,2,3] [4,5,6] trở thành 1,2,3 4,5,6 (do JavaScript có cơ chế ép kiểu gọi là coercion), nên kết quả là chuỗi "1,2,34,5,6". foo bar: dấu thứ hai ở đây được dùng để chuyển bar sang kiểu số. Nhưng nếu bar l
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