When your run 'a' + + 'a' you're doing 'a' + +'a'. JavaScript tries to cast +'a' to a number which is cleary impossible; so it returns NaN (Not a Number) and then it concatenates the NaN to other chars, creating the baNaNa string. The magic happens with the toLowerCase() method :)
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When your run
'a' + + 'a'you're doing'a' + +'a'. JavaScript tries to cast+'a'to a number which is cleary impossible; so it returns NaN (Not a Number) and then it concatenates the NaN to other chars, creating the baNaNa string. The magic happens with the toLowerCase() method :)