How do I print complete element arrays in Jint - like you can with Javascript?

Question

I'm trying to access a Javascript array through Jint. We're basically accepting custom javascript code in an application that works across a variety of platforms and are using Jint for .NET. We need the result to be the same - whether it's in .NET or vanilla JavaScript.

        private Engine _engine = new Engine();
        var testList = new List<int> { 1, 2, 3, 4, 5 };
        _engine.SetValue("testList", testList);
        var result = _engine.Execute("'Elements of the array are: ' + testList").GetCompletionValue();
        var finalVal = result.AsString();

I would expect the result to be:

Elements of the array are: 1,2,3,4,5 (similar to vanilla JavaScript)

However, it throws an exception.

System.InvalidOperationException: No matching indexer found.

Note that if I try to access just one element of the array (eg testList[1]) it works fine.

Am I doing something wrong here? If not, then can I implement a custom indexer to make this work?

score 0 · Answer 1 · answered Sep 24 '19 at 14:32

surround your testList with Array.from(). see example below

    private Engine _engine = new Engine();
    var testList = new List<int> { 1, 2, 3, 4, 5 };
    _engine.SetValue("testList", testList);
    var result = _engine.Execute("'Elements of the array are: ' + Array.from(testList)").GetCompletionValue();
    var finalVal = result.AsString();

How do I print complete element arrays in Jint - like you can with Javascript?

1 Answers1