mingo/esm/operators/update/pop.js

MongoDB query language for in-memory objects

import { isArray } from "../../util";
import { applyUpdate, DEFAULT_OPTIONS, walkExpression } from "./_internal";
const $pop = (expr, arrayFilters = [], options = DEFAULT_OPTIONS) => {
  return (obj) => {
    return walkExpression(
      expr,
      arrayFilters,
      options,
      (val, node, queries) => {
        return applyUpdate(
          obj,
          node,
          queries,
          (o, k) => {
            const arr = o[k];
            if (!isArray(arr) || !arr.length) return false;
            if (val === -1) arr.splice(0, 1);
            else arr.pop();
            return true;
          }
        );
      }
    );
  };
};
export {
  $pop
};