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Yes, variables can have a value of undefined and you can explicitly assign values to them. Assigning undefined to a variable though is probably confusing, since it's a bit of a paradox (you've defined the variable as undefined) and it's not possible to distinguish that variable from either variables that don't exist or uninitialised variables. This aspect of 3274 Tesla Interior Stock Photos High Res Pictures And plays a vital role in practical applications.
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- How can I check for "undefined" in JavaScript? - Stack Overflow.
- What is the difference in JavaScript between 'undefined' and 'not ...
- What is the difference between null and undefined in JavaScript?
- How can I check for an undefined or null variable in JavaScript?
- The difference between typeof x ! "undefined" and x ! null.
- JavaScript undefined ! undefined? - Stack Overflow.
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