31 lines
775 B
JavaScript
31 lines
775 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var GetIntrinsic = require('get-intrinsic');
|
||
|
|
|
||
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
||
|
|
|
||
|
|
var Call = require('./Call');
|
||
|
|
var GetV = require('./GetV');
|
||
|
|
var IsCallable = require('./IsCallable');
|
||
|
|
var Type = require('./Type');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/14.0/#sec-getiteratorfrommethod
|
||
|
|
|
||
|
|
module.exports = function GetIteratorFromMethod(obj, method) {
|
||
|
|
if (!IsCallable(method)) {
|
||
|
|
throw new $TypeError('method must be a function');
|
||
|
|
}
|
||
|
|
|
||
|
|
var iterator = Call(method, obj); // step 1
|
||
|
|
if (Type(iterator) !== 'Object') {
|
||
|
|
throw new $TypeError('iterator must return an object'); // step 2
|
||
|
|
}
|
||
|
|
|
||
|
|
var nextMethod = GetV(iterator, 'next'); // step 3
|
||
|
|
return { // steps 4-5
|
||
|
|
'[[Iterator]]': iterator,
|
||
|
|
'[[NextMethod]]': nextMethod,
|
||
|
|
'[[Done]]': false
|
||
|
|
};
|
||
|
|
};
|