JSON > Iterating

THtJSON elements of object and array type supports iterators.

Example:

    JS.Parse('{"result": [1, 2, 3]}');
    for var E in JS['result'] do
       v := v + E.AsInteger;

Node list returned by Find method (See JSON Path) also supports iteration.

For E in JS.Find('result.orders.*.product') do
..

Note that each item is fetched on-demand so there is no memory consumption when processing large sets and first element is returned quickly.

Iterator has the following methods:

Count: NativeInt; - number of elements

Sum: double; - sum of numeric values

Max: double - max numeric value

Min: double; - min numeric value

Last: PHtJSON - last element

List(const ASeparator: string): string - Combine values into single string

Template(const ATemplate: string; const ASeparator: string = ''): string - Combine elements using HTML template. Example:

JS.Find('result.orders.*').Template('<div class="order"><div class="id">{{id}}</div><div class="product">{{product.name}}></div></div>');

JSONTemplate(const ATemplate: string): string; Combine items using JSON template

Deserialize(AConstructor: THtDeserializeCreate); Convert to list of objects. Example:

JS.Find('result.orders.*').Deserialize(
  function: TObject
  begin
    Result := TMyOrder.Create;
    Orders.Add(Result);
  end
);

TMyOrder properties and fields with the same names as JSON keys will be filled by JSON values.