29 lines
1 KiB
JavaScript
29 lines
1 KiB
JavaScript
'use strict';
|
|
var charAt = require('../internals/string-multibyte').charAt;
|
|
var InternalStateModule = require('../internals/internal-state');
|
|
var defineIterator = require('../internals/define-iterator');
|
|
|
|
var STRING_ITERATOR = 'String Iterator';
|
|
var setInternalState = InternalStateModule.set;
|
|
var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);
|
|
|
|
// `String.prototype[@@iterator]` method
|
|
// https://tc39.github.io/ecma262/#sec-string.prototype-@@iterator
|
|
defineIterator(String, 'String', function (iterated) {
|
|
setInternalState(this, {
|
|
type: STRING_ITERATOR,
|
|
string: String(iterated),
|
|
index: 0
|
|
});
|
|
// `%StringIteratorPrototype%.next` method
|
|
// https://tc39.github.io/ecma262/#sec-%stringiteratorprototype%.next
|
|
}, function next() {
|
|
var state = getInternalState(this);
|
|
var string = state.string;
|
|
var index = state.index;
|
|
var point;
|
|
if (index >= string.length) return { value: undefined, done: true };
|
|
point = charAt(string, index);
|
|
state.index += point.length;
|
|
return { value: point, done: false };
|
|
});
|