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AI solution for JavaScript Quiz on BFE.dev
45. Hoisting VI
The code will output the following by console.log:
undefined
1
2
3
1
Explanation:
- At the first console.log statement,
foo
is not defined yet within the function scope so it outputsundefined
. - The second console.log statement outputs the global variable
foo
which has a value of1
. - The third console.log statement outputs the updated local variable
foo
value which is2
. - After the
var foo = 3
statement, the fourth console.log statement outputs the updated local variablefoo
value which is3
. - The final console.log statement outputs the global variable
foo
which still has a value of1
. This happens because the localfoo
variable was declared later in the function and is hoisted to the beginning of the function, but its assignment (var foo = 3
) happens later. Therefore, the previousfoo = 2
statement assigned the value to the global variablefoo
instead of the local one.