1
0
mirror of https://github.com/musix-org/musix-oss synced 2024-12-24 01:43:18 +00:00
musix-oss/node_modules/core-js/modules/esnext.iterator.reduce.js

26 lines
854 B
JavaScript
Raw Normal View History

2020-03-03 20:30:50 +00:00
'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var iterate = require('../internals/iterate');
var aFunction = require('../internals/a-function');
var anObject = require('../internals/an-object');
$({ target: 'Iterator', proto: true, real: true }, {
reduce: function reduce(reducer /* , initialValue */) {
anObject(this);
aFunction(reducer);
var noInitial = arguments.length < 2;
var accumulator = noInitial ? undefined : arguments[1];
iterate(this, function (value) {
if (noInitial) {
noInitial = false;
accumulator = value;
} else {
accumulator = reducer(accumulator, value);
}
}, undefined, false, true);
if (noInitial) throw TypeError('Reduce of empty iterator with no initial value');
return accumulator;
}
});