A couple of months back, I've started posting colorful JavaScript code snippets that you can use to check your JS skills on my blog. Every problem has the correct answer and explanation. But I strongly suggest you first try to solve it yourself.
Every day in February I'm going to post a new JS test here on Dev.to. Follow, like, comment if it's something you're interested in.
Let's go 🚀!
What’s going to be printed to the console?
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In the first line, we define the variable str
and initialize it as a string with the value 1
.
In the second line, there are two typecasts, first !str
gives us false
, and then +false
converts boolean
into a number 0
.
Eventually, in the third line, the typeof
operator looks up the current type of str
which is number
.
ANSWER: string number
will be printed to the console
Discussion (1)
so we go from a string, to a boolean, to a number, wow. :)