message: util add concatArray
diff: @@ -630,4 +630,17 @@ export function createHashMap(obj) {
  return new HashMap(obj);
  }
  +export function concatArray(a, b) {
  + var newArray = new a.constructor(a.length + b.length);
  + for (var i = 0; i < a.length; i++) {
  + newArray[i] = a[i];
  + }
  + var offset = a.length;
  + for (i = 0; i < b.length; i++) {
  + newArray[i + offset] = b[i];
  + }
  + return newArray;
  +}
  +
  +
  export function noop() {}
  