You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
31 lines
1.1 KiB
31 lines
1.1 KiB
'use strict'; |
|
var $ = require('../internals/export'); |
|
var global = require('../internals/global'); |
|
var aCallable = require('../internals/a-callable'); |
|
var anObject = require('../internals/an-object'); |
|
var getSetIterator = require('../internals/get-set-iterator'); |
|
var iterate = require('../internals/iterate'); |
|
|
|
var TypeError = global.TypeError; |
|
|
|
// `Set.prototype.reduce` method |
|
// https://github.com/tc39/proposal-collection-methods |
|
$({ target: 'Set', proto: true, real: true, forced: true }, { |
|
reduce: function reduce(callbackfn /* , initialValue */) { |
|
var set = anObject(this); |
|
var iterator = getSetIterator(set); |
|
var noInitial = arguments.length < 2; |
|
var accumulator = noInitial ? undefined : arguments[1]; |
|
aCallable(callbackfn); |
|
iterate(iterator, function (value) { |
|
if (noInitial) { |
|
noInitial = false; |
|
accumulator = value; |
|
} else { |
|
accumulator = callbackfn(accumulator, value, value, set); |
|
} |
|
}, { IS_ITERATOR: true }); |
|
if (noInitial) throw TypeError('Reduce of empty set with no initial value'); |
|
return accumulator; |
|
} |
|
});
|
|
|