Function count

count<T>(where, queryable, options): Promise<number>
Queries an array of Graphics or Features using an SQL 'where' clause and/or a spatial filter, and returns the number of matching items.
Type Parameters
- T extends Graphic | Feature
Parameters
- where: string
  The SQL where clause with which to query.
- queryable: T[]
  The array of Graphics/Features to query.
- options: QueryOptions
  Additional options to use as a part of the query.
Returns Promise<number>