mingo/esm/operators/expression/array/map.js

MongoDB query language for in-memory objects

import { ComputeOptions, computeValue } from "../../../core/_internal";
import { assert, isArray, isNil } from "../../../util";
const $map = (obj, expr, options) => {
  const input = computeValue(obj, expr.input, null, options);
  if (isNil(input)) return null;
  assert(isArray(input), `$map 'input' expression must resolve to an array`);
  const copts = ComputeOptions.init(options);
  const k = expr.as || "this";
  const locals = {
    variables: { [k]: null }
  };
  return input.map((o) => {
    locals.variables[k] = o;
    return computeValue(obj, expr.in, null, copts.update(locals));
  });
};
export {
  $map
};