index.js
function chop(keywords) {
 return keywords.slice(0)
  .reduce(function(acc, ele) {
    acc = acc.concat(ele.split('-'));
    return acc;
  }, []);
}
function chop(keywords) {
 return keywords.slice(0)
  .reduce(function(acc, ele) {
    acc = acc.concat(ele.split('-'));
    return acc;
  }, []);
}
function chop ( keywords ) { return keywords . slice ( 0 ) . reduce ( function ( acc , ele ) { acc = acc . concat ( ele . split ( '-' ) ) ; return acc ; } , [ ] ) ; }
Clone the array and split words by dashes,
then concat the results back into the array

@param  {Array} keywords
@return {Array}
Clone the array and split words by dashes then concat the results back into the array