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esnext.map.reduce.js928 B
'use strict'; var $ = require('../internals/export'); var aCallable = require('../internals/a-callable'); var aMap = require('../internals/a-map'); var iterate = require('../internals/map-iterate'); var $TypeError = TypeError; // `Map.prototype.reduce` method // https://github.com/tc39/proposal-collection-methods $({ target: 'Map', proto: true, real: true, forced: true }, { reduce: function reduce(callbackfn /* , initialValue */) { var map = aMap(this); var noInitial = arguments.length < 2; var accumulator = noInitial ? undefined : arguments[1]; aCallable(callbackfn); iterate(map, function (value, key) { if (noInitial) { noInitial = false; accumulator = value; } else { accumulator = callbackfn(accumulator, value, key, map); } }); if (noInitial) throw new $TypeError('Reduce of empty map with no initial value'); return accumulator; } });

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