risk of javascript undefined variable

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var objFiles = [{"name": "FileA"},{"name": "FileB"}];
var strHtml; //undefined

$.each(objFiles, function(i, v){
	strHtml += '
'+v.name+'
';
});
console.log(strHtml); //undefined
FileA
FileB

var objFiles = [{"name": "FileA"},{"name": "FileB"}];
var strHtml  = '';

$.each(objFiles, function(i, v){
	strHtml += '
'+v.name+'
';
});
console.log(strHtml); //
FileA
FileB