'first'

fcs

2025-04-10 0163870d662dc5b7d69ceff977490ede594f7d82

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
'use strict';
 
var hasSymbols = require('has-symbols')();
 
var ES2015 = require('./es2015');
var assign = require('./helpers/assign');
 
var callBound = require('./helpers/callBound');
 
var $arrayPush = callBound('Array.prototype.push');
var $arraySlice = callBound('Array.prototype.slice');
var $arrayJoin = callBound('Array.prototype.join');
 
var ES2016 = assign(assign({}, ES2015), {
    // https://www.ecma-international.org/ecma-262/7.0/#sec-samevaluenonnumber
    SameValueNonNumber: function SameValueNonNumber(x, y) {
        if (typeof x === 'number' || typeof x !== typeof y) {
            throw new TypeError('SameValueNonNumber requires two non-number values of the same type.');
        }
        return this.SameValue(x, y);
    },
 
    // https://www.ecma-international.org/ecma-262/7.0/#sec-iterabletoarraylike
    IterableToArrayLike: function IterableToArrayLike(items) {
        var usingIterator;
        if (hasSymbols) {
            usingIterator = this.GetMethod(items, Symbol.iterator);
        } else if (this.IsArray(items)) {
            usingIterator = function () {
                var i = -1;
                var arr = this; // eslint-disable-line no-invalid-this
                return {
                    next: function () {
                        i += 1;
                        return {
                            done: i >= arr.length,
                            value: arr[i]
                        };
                    }
                };
            };
        } else if (this.Type(items) === 'String') {
            var ES = this;
            usingIterator = function () {
                var i = 0;
                return {
                    next: function () {
                        var nextIndex = ES.AdvanceStringIndex(items, i, true);
                        var value = $arrayJoin($arraySlice(items, i, nextIndex), '');
                        i = nextIndex;
                        return {
                            done: nextIndex > items.length,
                            value: value
                        };
                    }
                };
            };
        }
        if (typeof usingIterator !== 'undefined') {
            var iterator = this.GetIterator(items, usingIterator);
            var values = [];
            var next = true;
            while (next) {
                next = this.IteratorStep(iterator);
                if (next) {
                    var nextValue = this.IteratorValue(next);
                    $arrayPush(values, nextValue);
                }
            }
            return values;
        }
 
        return this.ToObject(items);
    }
});
 
module.exports = ES2016;