Error: array.reduce(...) is not a function

Challenge http://www.freecodecamp.com/challenges/waypoint-condense-arrays-with-reduce has an issue.

Error: array.reduce(…) is not a function

My code:

var array = [4,5,6,7,8];
var singleVal = 0;
// Only change code below this line.

singleVal = array.reduce(function(prev, cur) {
  return prev + cur;
})

// Only change code above this line.
(function() {return(singleVal);})();

[benschenker]

@BerkeleyTrue, Agreed about the semicolons but is it possible to have a better error displayed? Right now it just says YYY is not a function and that isn’t really helpful in this situation.

[zloy531]

But I still think what this is a bug. Semicolons isn’t necessary in EcmaScript. Result should not depend on semicolons. Or, at least, error must be more verbose.