I'm feeling really lost and would appreciate some help.
Can someone explain why...?
true++
This code snippet produces...
"Uncaught SyntaxError: Invalid left-hand side expression in postfix operation"
However, if we try...
undefined++
We get...
NaN
Furthermore, if we try this instead...
let a = true;
a++;
a;
The end result is 2.
In order to increment a value, it must be something that can be assigned to, such as a variable, an array element, or an object property. Constants cannot be incremented. For example, attempting to execute true++ will result in a syntax error, as will trying to assign a value to constants like true=5, 12++, or 13=7.
While undefined is not considered a constant and is traditionally a property of the global object due to a historical issue in early JavaScript versions, attempting to increment it with undefined++ may not throw an error (although it does not have any practical meaning and triggers an error in strict mode).
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