JavaScript distinct, new Jint Set

DistinctBenchmark.cs

using BenchmarkDotNet.Attributes;

namespace Jint.Benchmark
{
    [MemoryDiagnoser]
    public class DistinctBenchmark
    {
        private const string script = @"
var x = {'Items':[{'ItemId':'the-item--1'},{'ItemId':'the-item-1'},{'ItemId':'the-item-1'},{'ItemId':'the-item-3'},{'ItemId':'the-item-3'},{'ItemId':'the-item-5'},{'ItemId':'the-item-5'},{'ItemId':'the-item-7'},{'ItemId':'the-item-7'},{'ItemId':'the-item-9'},{'ItemId':'the-item-9'},{'ItemId':'the-item-11'},{'ItemId':'the-item-11'},{'ItemId':'the-item-13'},{'ItemId':'the-item-13'},{'ItemId':'the-item-15'},{'ItemId':'the-item-15'},{'ItemId':'the-item-17'},{'ItemId':'the-item-17'},{'ItemId':'the-item-19'},{'ItemId':'the-item-19'},{'ItemId':'the-item-21'},{'ItemId':'the-item-21'},{'ItemId':'the-item-23'},{'ItemId':'the-item-23'},{'ItemId':'the-item-25'},{'ItemId':'the-item-25'},{'ItemId':'the-item-27'},{'ItemId':'the-item-27'},{'ItemId':'the-item-29'},{'ItemId':'the-item-29'},{'ItemId':'the-item-31'},{'ItemId':'the-item-31'},{'ItemId':'the-item-33'},{'ItemId':'the-item-33'},{'ItemId':'the-item-35'},{'ItemId':'the-item-35'},{'ItemId':'the-item-37'},{'ItemId':'the-item-37'},{'ItemId':'the-item-39'},{'ItemId':'the-item-39'},{'ItemId':'the-item-41'},{'ItemId':'the-item-41'},{'ItemId':'the-item-43'},{'ItemId':'the-item-43'},{'ItemId':'the-item-45'},{'ItemId':'the-item-45'},{'ItemId':'the-item-47'},{'ItemId':'the-item-47'},{'ItemId':'the-item-49'},{'ItemId':'the-item-49'},{'ItemId':'the-item-51'},{'ItemId':'the-item-51'},{'ItemId':'the-item-53'},{'ItemId':'the-item-53'},{'ItemId':'the-item-55'},{'ItemId':'the-item-55'},{'ItemId':'the-item-57'},{'ItemId':'the-item-57'},{'ItemId':'the-item-59'},{'ItemId':'the-item-59'},{'ItemId':'the-item-61'},{'ItemId':'the-item-61'},{'ItemId':'the-item-63'},{'ItemId':'the-item-63'},{'ItemId':'the-item-65'},{'ItemId':'the-item-65'},{'ItemId':'the-item-67'},{'ItemId':'the-item-67'},{'ItemId':'the-item-69'},{'ItemId':'the-item-69'},{'ItemId':'the-item-71'},{'ItemId':'the-item-71'},{'ItemId':'the-item-73'},{'ItemId':'the-item-73'},{'ItemId':'the-item-75'},{'ItemId':'the-item-75'},{'ItemId':'the-item-77'},{'ItemId':'the-item-77'},{'ItemId':'the-item-79'},{'ItemId':'the-item-79'},{'ItemId':'the-item-81'},{'ItemId':'the-item-81'},{'ItemId':'the-item-83'},{'ItemId':'the-item-83'},{'ItemId':'the-item-85'},{'ItemId':'the-item-85'},{'ItemId':'the-item-87'},{'ItemId':'the-item-87'},{'ItemId':'the-item-89'},{'ItemId':'the-item-89'},{'ItemId':'the-item-91'},{'ItemId':'the-item-91'},{'ItemId':'the-item-93'},{'ItemId':'the-item-93'},{'ItemId':'the-item-95'},{'ItemId':'the-item-95'},{'ItemId':'the-item-97'},{'ItemId':'the-item-97'},{'ItemId':'the-item-99'},{'ItemId':'the-item-99'},{'ItemId':'the-item-101'},{'ItemId':'the-item-101'},{'ItemId':'the-item-103'},{'ItemId':'the-item-103'},{'ItemId':'the-item-105'},{'ItemId':'the-item-105'},{'ItemId':'the-item-107'},{'ItemId':'the-item-107'},{'ItemId':'the-item-109'},{'ItemId':'the-item-109'},{'ItemId':'the-item-111'},{'ItemId':'the-item-111'},{'ItemId':'the-item-113'},{'ItemId':'the-item-113'},{'ItemId':'the-item-115'},{'ItemId':'the-item-115'},{'ItemId':'the-item-117'},{'ItemId':'the-item-117'},{'ItemId':'the-item-119'},{'ItemId':'the-item-119'},{'ItemId':'the-item-121'},{'ItemId':'the-item-121'},{'ItemId':'the-item-123'},{'ItemId':'the-item-123'},{'ItemId':'the-item-125'},{'ItemId':'the-item-125'},{'ItemId':'the-item-127'},{'ItemId':'the-item-127'},{'ItemId':'the-item-129'},{'ItemId':'the-item-129'},{'ItemId':'the-item-131'},{'ItemId':'the-item-131'},{'ItemId':'the-item-133'},{'ItemId':'the-item-133'},{'ItemId':'the-item-135'},{'ItemId':'the-item-135'},{'ItemId':'the-item-137'},{'ItemId':'the-item-137'},{'ItemId':'the-item-139'},{'ItemId':'the-item-139'},{'ItemId':'the-item-141'},{'ItemId':'the-item-141'},{'ItemId':'the-item-143'},{'ItemId':'the-item-143'},{'ItemId':'the-item-145'},{'ItemId':'the-item-145'},{'ItemId':'the-item-147'},{'ItemId':'the-item-147'},{'ItemId':'the-item-149'},{'ItemId':'the-item-149'},{'ItemId':'the-item-151'},{'ItemId':'the-item-151'},{'ItemId':'the-item-153'},{'ItemId':'the-item-153'},{'ItemId':'the-item-155'},{'ItemId':'the-item-155'},{'ItemId':'the-item-157'},{'ItemId':'the-item-157'},{'ItemId':'the-item-159'},{'ItemId':'the-item-159'},{'ItemId':'the-item-161'},{'ItemId':'the-item-161'},{'ItemId':'the-item-163'},{'ItemId':'the-item-163'},{'ItemId':'the-item-165'},{'ItemId':'the-item-165'},{'ItemId':'the-item-167'},{'ItemId':'the-item-167'},{'ItemId':'the-item-169'},{'ItemId':'the-item-169'},{'ItemId':'the-item-171'},{'ItemId':'the-item-171'},{'ItemId':'the-item-173'},{'ItemId':'the-item-173'},{'ItemId':'the-item-175'},{'ItemId':'the-item-175'},{'ItemId':'the-item-177'},{'ItemId':'the-item-177'},{'ItemId':'the-item-179'},{'ItemId':'the-item-179'},{'ItemId':'the-item-181'},{'ItemId':'the-item-181'},{'ItemId':'the-item-183'},{'ItemId':'the-item-183'},{'ItemId':'the-item-185'},{'ItemId':'the-item-185'},{'ItemId':'the-item-187'},{'ItemId':'the-item-187'},{'ItemId':'the-item-189'},{'ItemId':'the-item-189'},{'ItemId':'the-item-191'},{'ItemId':'the-item-191'},{'ItemId':'the-item-193'},{'ItemId':'the-item-193'},{'ItemId':'the-item-195'},{'Ite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the-item-965'},{'ItemId':'the-item-965'},{'ItemId':'the-item-967'},{'ItemId':'the-item-967'},{'ItemId':'the-item-969'},{'ItemId':'the-item-969'},{'ItemId':'the-item-971'},{'ItemId':'the-item-971'},{'ItemId':'the-item-973'},{'ItemId':'the-item-973'},{'ItemId':'the-item-975'},{'ItemId':'the-item-975'},{'ItemId':'the-item-977'},{'ItemId':'the-item-977'},{'ItemId':'the-item-979'},{'ItemId':'the-item-979'},{'ItemId':'the-item-981'},{'ItemId':'the-item-981'},{'ItemId':'the-item-983'},{'ItemId':'the-item-983'},{'ItemId':'the-item-985'},{'ItemId':'the-item-985'},{'ItemId':'the-item-987'},{'ItemId':'the-item-987'},{'ItemId':'the-item-989'},{'ItemId':'the-item-989'},{'ItemId':'the-item-991'},{'ItemId':'the-item-991'},{'ItemId':'the-item-993'},{'ItemId':'the-item-993'},{'ItemId':'the-item-995'},{'ItemId':'the-item-995'},{'ItemId':'the-item-997'},{'ItemId':'the-item-997'},{'ItemId':'the-item-999'},{'ItemId':'the-item-999'},{'ItemId':'the-item-1001'},{'ItemId':'the-item-1001'},{'ItemId':'the-item-1003'},{'ItemId':'the-item-1003'},{'ItemId':'the-item-1005'},{'ItemId':'the-item-1005'},{'ItemId':'the-item-1007'},{'ItemId':'the-item-1007'},{'ItemId':'the-item-1009'},{'ItemId':'the-item-1009'},{'ItemId':'the-item-1011'},{'ItemId':'the-item-1011'},{'ItemId':'the-item-1013'},{'ItemId':'the-item-1013'},{'ItemId':'the-item-1015'},{'ItemId':'the-item-1015'},{'ItemId':'the-item-1017'},{'ItemId':'the-item-1017'},{'ItemId':'the-item-1019'},{'ItemId':'the-item-1019'},{'ItemId':'the-item-1021'},{'ItemId':'the-item-1021'},{'ItemId':'the-item-1023'},{'ItemId':'the-item-1023'},{'ItemId':'the-item-1025'},{'ItemId':'the-item-1025'},{'ItemId':'the-item-1027'},{'ItemId':'the-item-1027'},{'ItemId':'the-item-1029'},{'ItemId':'the-item-1029'},{'ItemId':'the-item-1031'},{'ItemId':'the-item-1031'},{'ItemId':'the-item-1033'},{'ItemId':'the-item-1033'},{'ItemId':'the-item-1035'},{'ItemId':'the-item-1035'},{'ItemId':'the-item-1037'},{'ItemId':'the-item-1037'},{'ItemId':'the-item-1039'},{'ItemId':'the-item-1039'},{'ItemId':'the-item-1041'},{'ItemId':'the-item-1041'},{'ItemId':'the-item-1043'},{'ItemId':'the-item-1043'},{'ItemId':'the-item-1045'},{'ItemId':'the-item-1045'},{'ItemId':'the-item-1047'},{'ItemId':'the-item-1047'},{'ItemId':'the-item-1049'},{'ItemId':'the-item-1049'},{'ItemId':'the-item-1051'},{'ItemId':'the-item-1051'},{'ItemId':'the-item-1053'},{'ItemId':'the-item-1053'},{'ItemId':'the-item-1055'},{'ItemId':'the-item-1055'},{'ItemId':'the-item-1057'},{'ItemId':'the-item-1057'},{'ItemId':'the-item-1059'},{'ItemId':'the-item-1059'},{'ItemId':'the-item-1061'},{'ItemId':'the-item-1061'},{'ItemId':'the-item-1063'},{'ItemId':'the-item-1063'},{'ItemId':'the-item-1065'},{'ItemId':'the-item-1065'},{'ItemId':'the-item-1067'},{'ItemId':'the-item-1067'},{'ItemId':'the-item-1069'},{'ItemId':'the-item-1069'},{'ItemId':'the-item-1071'},{'ItemId':'the-item-1071'},{'ItemId':'the-item-1073'},{'ItemId':'the-item-1073'},{'ItemId':'the-item-1075'},{'ItemId':'the-item-1075'},{'ItemId':'the-item-1077'},{'ItemId':'the-item-1077'},{'ItemId':'the-item-1079'},{'ItemId':'the-item-1079'},{'ItemId':'the-item-1081'},{'ItemId':'the-item-1081'},{'ItemId':'the-item-1083'},{'ItemId':'the-item-1083'},{'ItemId':'the-item-1085'},{'ItemId':'the-item-1085'},{'ItemId':'the-item-1087'},{'ItemId':'the-item-1087'},{'ItemId':'the-item-1089'},{'ItemId':'the-item-1089'},{'ItemId':'the-item-1091'},{'ItemId':'the-item-1091'},{'ItemId':'the-item-1093'},{'ItemId':'the-item-1093'},{'ItemId':'the-item-1095'},{'ItemId':'the-item-1095'},{'ItemId':'the-item-1097'},{'ItemId':'the-item-1097'},{'ItemId':'the-item-1099'},{'ItemId':'the-item-1099'},{'ItemId':'the-item-1101'},{'ItemId':'the-item-1101'},{'ItemId':'the-item-1103'},{'ItemId':'the-item-1103'},{'ItemId':'the-item-1105'},{'ItemId':'the-item-1105'},{'ItemId':'the-item-1107'},{'ItemId':'the-item-1107'},{'ItemId':'the-item-1109'},{'ItemId':'the-item-1109'},{'ItemId':'the-item-1111'},{'ItemId':'the-item-1111'},{'ItemId':'the-item-1113'},{'ItemId':'the-item-1113'},{'ItemId':'the-item-1115'},{'ItemId':'the-item-1115'},{'ItemId':'the-item-1117'},{'ItemId':'the-item-1117'},{'ItemId':'the-item-1119'},{'ItemId':'the-item-1119'},{'ItemId':'the-item-1121'},{'ItemId':'the-item-1121'},{'ItemId':'the-item-1123'},{'ItemId':'the-item-1123'},{'ItemId':'the-item-1125'},{'ItemId':'the-item-1125'},{'ItemId':'the-item-1127'},{'ItemId':'the-item-1127'},{'ItemId':'the-item-1129'},{'ItemId':'the-item-1129'},{'ItemId':'the-item-1131'},{'ItemId':'the-item-1131'},{'ItemId':'the-item-1133'},{'ItemId':'the-item-1133'},{'ItemId':'the-item-1135'},{'ItemId':'the-item-1135'},{'ItemId':'the-item-1137'},{'ItemId':'the-item-1137'},{'ItemId':'the-item-1139'},{'ItemId':'the-item-1139'},{'ItemId':'the-item-1141'},{'ItemId':'the-item-1141'},{'ItemId':'the-item-1143'},{'ItemId':'the-item-1143'},{'ItemId':'the-item-1145'},{'ItemId':'the-item-1145'},{'ItemId':'the-item-1147'},{'ItemId':'the-item-1147'},{'ItemId':'the-item-1149'},{'ItemId':'the-item-1149'},{'ItemId':'the-item-1151'},{'ItemId':'the-item-1151'},{'ItemId':'the-item-1153'},{'ItemId':'the-item-1153'},{'ItemId':'the-item-1155'},{'ItemId':'the-item-1155'},{'ItemId':'the-item-1157'},{'ItemId':'the-item-1157'},{'ItemId':'the-item-1159'},{'ItemId':'the-item-1159'},{'ItemId':'the-item-1161'},{'ItemId':'the-item-1161'}]};
";
        private Engine engine;

        [GlobalSetup]
        public void Setup()
        {
            engine = new Engine();
            engine.Execute(script);
        }

        [Benchmark]
        public void Original()
        {
            engine.Execute("x.Items.map(function(i){return i.ItemId;}).filter(function (value, index) { return x.Items.map((function(i){return i.ItemId;})).indexOf(value) == index});");
        }

        [Benchmark]
        public void ArrayFrom()
        {
            engine.Execute("Array.from(new Set(x.Items.map(function(i){return i.ItemId;})))");
        }

        [Benchmark]
        public void Spread()
        {
            engine.Execute("[...new Set(x.Items.map(function(i){return i.ItemId;}))]");
        }
    }
}

Results.md

BenchmarkDotNet=v0.11.2, OS=Windows 10.0.17763.195 (1809/October2018Update/Redstone5)
Intel Core i7-6820HQ CPU 2.70GHz (Skylake), 1 CPU, 8 logical and 4 physical cores
.NET Core SDK=2.2.101
  [Host]     : .NET Core 2.0.9 (CoreCLR 4.6.26614.01, CoreFX 4.6.26614.01), 64bit RyuJIT
  DefaultJob : .NET Core 2.0.9 (CoreCLR 4.6.26614.01, CoreFX 4.6.26614.01), 64bit RyuJIT

Method	Mean	Error	StdDev	Gen 0/1k Op	Gen 1/1k Op	Gen 2/1k Op	Allocated Memory/Op
Original	460.334 ms	1.0065 ms	0.8922 ms	57000.0000	-	-	233743.41 KB
ArrayFrom	3.940 ms	0.0188 ms	0.0176 ms	179.6875	39.0625	-	744.32 KB
Spread	3.862 ms	0.0042 ms	0.0035 ms	179.6875	42.9688	-	743.8 KB