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.
29 lines
1.1 KiB
29 lines
1.1 KiB
'use strict';
|
|
var $ = require('../internals/export');
|
|
var IS_PURE = require('../internals/is-pure');
|
|
var anObject = require('../internals/an-object');
|
|
var aFunction = require('../internals/a-function');
|
|
var getSetIterator = require('../internals/get-set-iterator');
|
|
var iterate = require('../internals/iterate');
|
|
|
|
// `Set.prototype.reduce` method
|
|
// https://github.com/tc39/proposal-collection-methods
|
|
$({ target: 'Set', proto: true, real: true, forced: IS_PURE }, {
|
|
reduce: function reduce(callbackfn /* , initialValue */) {
|
|
var set = anObject(this);
|
|
var iterator = getSetIterator(set);
|
|
var noInitial = arguments.length < 2;
|
|
var accumulator = noInitial ? undefined : arguments[1];
|
|
aFunction(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;
|
|
}
|
|
});
|
|
|