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Predict the output of the JAVASCRIPT Program,
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Answer — undefined and ReferenceError
Explanation — Within the function, we first declare the name variable with the var keyword. This means that the variable gets hoisted (memory space is set up during the creation phase) with the default value of undefined, until we actually get to the line where we define the variable. We haven't defined the variable yet on the line where we try to log the name variable, so it still holds the value of undefined.
Variables with the let keyword (and const) are hoisted, but unlike var, don't get initialized. They are not accessible before the line we declare (initialize) them. This is called the "temporal dead zone". When we try to access the variables before they are declared, JavaScript throws a ReferenceError.
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predict the output of the given question.
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Predict the output of the JAVASCRIPT Program,
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Answer — "name", "age"
Explanation —With a for-in loop, we can iterate through object keys, in this case name and age. Under the hood, object keys are strings (if they're not a Symbol). On every loop, we set the value of item equal to the current key it’s iterating over. First, item is equal to name, and gets logged. Then, item is equal to age, which gets logged.
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Predict the output of the JAVA Program,
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Correct Answer: 1
-1
0xff is the maximum value of a byte. And in Decimal maximum value of a byte is -1.
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