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console.log('b' + 'a' + + 'n' + 'a' + 'n' + 'a')

Explanation:

The expression is evaluated as

'b' + 'a' + + 'n' + 'a' + 'n' + 'a'

which converts ‘b’ + ‘a’ + (+’n’) to not a number. and therefore the output is

"baNaNana"