javascript - String is not a function -

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i keep on getting "string not function" error on line five.

    function swapcase(str) {      var words = []     var q = str          (var = 0; i<q.length; i++) {           if (q(i) === q(i).tolowercase) {            var upper = q(i).touppercase               words.push(upper)          };          else {              var lower = q(i).tolowercase                  words.push(lower)          };        };      words.join        return words;      };     swapcase("heleeer")

i still noobie @ coding sorry missing semi-colons , other spacing , indenting errors.

q(i)

that's function call, q string, not function.

you can single character string using array indexing: q[i].

separately, want call tolowercase , touppercase functions.
also, words.join has no effect, 2 reasons.


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