concat
Merge many collections together into a DefineList.
    list.concat(...args)
  
  Returns a DefineList with the list's items and the additional args.
Parameters
- args {Array|can-define/list/list|*}:Any number of arrays, Lists, or values to add in For each parameter given, if it is an Array or a DefineList, each of its elements will be added to the end of the concatenated DefineList. Otherwise, the parameter itself will be added. 
Use
concat makes a new DefineList with the elements of the DefineList followed by the elements of the parameters.
var list = new DefineList();
var newList = list.concat(
    'Alice',
    ['Bob', 'Charlie']),
    new DefineList(['Daniel', 'Eve']),
    {f: 'Francis'}
);
newList.get(); // ['Alice', 'Bob', 'Charlie', 'Daniel', 'Eve', {f: 'Francis'}]
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