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#1

When I use ‘‘const resultString = resultArray.toUpperCase();’’ I get a SyntaxError while when I use “const resultString = resultArray.join(’’).toUpperCase();” It’s work. somebody can explain me why?

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#2

Thanks for asking I hope I can help.

The answer I think is because you are trying to change the case of an array with .toUpperCase() this is a string method so won’t work on an array. In your second line you apply it to a string that’s why it works in the second and not the first.

Here’s a reference for it String.prototype.toUpperCase() - JavaScript | MDN