esnext.map.update.js 1.0 KB

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  1. 'use strict';
  2. var IS_PURE = require('../internals/is-pure');
  3. var $ = require('../internals/export');
  4. var global = require('../internals/global');
  5. var call = require('../internals/function-call');
  6. var anObject = require('../internals/an-object');
  7. var aCallable = require('../internals/a-callable');
  8. var TypeError = global.TypeError;
  9. // `Set.prototype.update` method
  10. // https://github.com/tc39/proposal-collection-methods
  11. $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
  12. update: function update(key, callback /* , thunk */) {
  13. var map = anObject(this);
  14. var get = aCallable(map.get);
  15. var has = aCallable(map.has);
  16. var set = aCallable(map.set);
  17. var length = arguments.length;
  18. aCallable(callback);
  19. var isPresentInMap = call(has, map, key);
  20. if (!isPresentInMap && length < 3) {
  21. throw TypeError('Updating absent value');
  22. }
  23. var value = isPresentInMap ? call(get, map, key) : aCallable(length > 2 ? arguments[2] : undefined)(key, map);
  24. call(set, map, key, callback(value, key, map));
  25. return map;
  26. }
  27. });