Will we see any output? If yes, then what would it be?
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To answer this question correctly, you need to understand the typecast rules in JS.
The arithmetic operations +
and -
have the same priority, so the value of x
will be calculated from left to right without any exceptions.
First, we concatenate the string '2'
with the number 3
. The result is the string '23'
.
Second, we try to subtract the boolean value true
from the string '23'
. To make this operation possible, both boolean and a string have to be cast to a number. Non-surprisingly '23'
becomes 23
and true
is turned to 1
. Eventually, we do the subtraction and get the result, number 22
.
The last step is to add the string '1'
to the number 22
. Applying the same concatenation that we did on the first step gives us the result - a string '221'
.
ANSWER: there are no issues with the expression in line 1. The value of x
is a string ’221’
, which will be successfully logged to the screen.
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