queryLogic.isMember(query, record)

Used to tell if the query contains the instance object record.

import {QueryLogic} from "can";

const queryLogic = new QueryLogic();

const checkMember = queryLogic.isMember(
  {filter: {playerId: 5}},
  {id: 5, type: "3pt", playerId: 5, gameId: 7}
);
console.log( checkMember ); //-> true

Use index to know where to insert the record into a list of records.

isMember ignores the query's page values and will return true if the query's filter matches the data. For example, "Zebra" might be the last record if all animals were sorted by name. However, isMember will still return true:

import {QueryLogic} from "can";

const animalQueryLogic = new QueryLogic();

const checkAnimal = animalQueryLogic.isMember(
  {sort: "name", page: {start: 0, end: 0}},
  {id: 1, name: "Zebra"}
);
console.log( checkAnimal ); //-> true

This is a limitation of QueryLogic when used with paginated sets of data.