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Versions: 27
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Contents
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $TypeError = GetIntrinsic('%TypeError%');
var $asyncIterator = GetIntrinsic('%Symbol.asyncIterator%', true);
var inspect = require('object-inspect');
var hasSymbols = require('has-symbols')();
var AdvanceStringIndex = require('./AdvanceStringIndex');
var CreateAsyncFromSyncIterator = require('./CreateAsyncFromSyncIterator');
var GetIteratorFromMethod = require('./GetIteratorFromMethod');
var GetMethod = require('./GetMethod');
var IsArray = require('./IsArray');
var getIteratorMethod = require('../helpers/getIteratorMethod');
// https://262.ecma-international.org/14.0/#sec-getiterator
module.exports = function GetIterator(obj, kind) {
if (kind !== 'sync' && kind !== 'async') {
throw new $TypeError("Assertion failed: `kind` must be one of 'sync' or 'async', got " + inspect(kind));
}
var method;
if (kind === 'async') { // step 1
if (hasSymbols && $asyncIterator) {
method = GetMethod(obj, $asyncIterator); // step 1.a
}
}
if (typeof method === 'undefined') { // step 1.b
// var syncMethod = GetMethod(obj, $iterator); // step 1.b.i
var syncMethod = getIteratorMethod(
{
AdvanceStringIndex: AdvanceStringIndex,
GetMethod: GetMethod,
IsArray: IsArray
},
obj
);
if (kind === 'async') {
if (typeof syncMethod === 'undefined') {
throw new $TypeError('iterator method is `undefined`'); // step 1.b.ii
}
var syncIteratorRecord = GetIteratorFromMethod(obj, syncMethod); // step 1.b.iii
return CreateAsyncFromSyncIterator(syncIteratorRecord); // step 1.b.iv
}
method = syncMethod; // step 2, kind of
}
if (typeof method === 'undefined') {
throw new $TypeError('iterator method is `undefined`'); // step 3
}
return GetIteratorFromMethod(obj, method); // step 4
};
Version data entries
27 entries across 27 versions & 2 rubygems