myArray[items].toUpperCase is not a function

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Why is using “for…in” with array iteration a bad idea? 25 answers

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I'm not sure this will guarantee the order of the elements in the array. The best solution would be to go with a for loop (both for performance and order):

for (var i=0, len=myArray.length; i<len; i++){
      msgupdate += myArray[i].toUpperCase()+' ';
}

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Use

msgupdate = myArray.map(function (i) { return i.toUpperCase() }).join(' ');

Using for/in isn't a good idea, without a hasOwnProperty check.

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