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What is the output of the following JavaScript code?console.log(['1', '2', '3'].map(parseInt).join(' '));

2363Medium DSSSB TGT Computer Science 0 replies 1 views

What is the output of the following JavaScript code?

console.log(['1', '2', '3'].map(parseInt).join(' '));

ANaN NaN NaN
B1 2 3
C1 NaN 3
D1 NaN NaN

Correct answer: D

Explanation

map passes (value, index), so the calls are parseInt('1', 0) = 1, parseInt('2', 1) = NaN (radix 1 is invalid) and parseInt('3', 2) = NaN ('3' is not a binary digit).

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