When {} + 1 is evaluated, the result is 1. However, if you assign this expression to a variable like x = {} + 1, the variable will contain the string "[object Object]1".
What causes the semantics of the right-hand side expression to change upon assignment? Shouldn't the right-hand side expression be consistent and "context-free"?
{} + 1
When you write {} + 1, it is seen as a code block followed by the number 1, resulting in 1. However:
x = {} + 1
This will be interpreted as adding new Object() to 1.
If you modify your original statement to:
new Object() + 1
You will get "[object Object]1" as the output.
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