Q157- Give output of below javascript statements:

• console.log([] + {});
  Output: "[object Object]"
  • [] becomes "" (empty string) when coerced to string.
  • {} becomes "[object Object]".
  • "" + "[object Object]" → "[object Object]".

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• console.log({} + {});
  Output: "[object Object][object Object]"
  • {} is treated as a block in JS if it’s the first statement.
  • The second {} is coerced to "[object Object]".
  • Using + with objects converts them to strings → "[object Object][object Object]".

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• console.log(+true);
  Output: 1
  • Unary + converts true → 1.

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• console.log("10" - "5");
  Output: 5
  • - operator converts strings to numbers → 10 - 5 = 5.

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• console.log("10" + "5");
  Output: "105"
  • + with strings → string concatenation → "10" + "5" = "105".

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• console.log(undefined + 1);
  Output: NaN
  • undefined converted to number → NaN + 1 = NaN.

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• console.log(NaN === NaN);
  Output: false
  • In JS, NaN is not equal to itself.

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• console.log(typeof null);
  Output: "object"
  • Legacy JS behavior; null is a primitive but typeof null returns "object".

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• console.log(!!"");
  Output: false
  • Empty string "" is falsy. !! converts it to boolean → false.

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• console.log(!!" ");
  Output: true
  • String with a space " " is truthy. !!" " → true.

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💡 Summary

• + operator can coerce types.
• - always converts to number.
• "" is falsy, " " is truthy.
• NaN is unique: not equal to itself.
• typeof null is "object" due to JS legacy behavior.