mathjs/lib/esm/utils/scope.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

import { ObjectWrappingMap, PartitionedMap } from './map.js';

/**
 * Create a new scope which can access the parent scope,
 * but does not affect it when written. This is suitable for variable definitions
 * within a block node, or function definition.
 *
 * If parent scope has a createSubScope method, it delegates to that. Otherwise,
 * creates an empty map, and copies the parent scope to it, adding in
 * the remaining `args`.
 *
 * @param {Map} parentScope
 * @param  {Object} args
 * @returns {PartitionedMap}
 */
export function createSubScope(parentScope, args) {
  return new PartitionedMap(parentScope, new ObjectWrappingMap(args), new Set(Object.keys(args)));
}