VB.NET

Eval JavaScript Returning Int

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Demonstrates getting the completion value of a JavaScript that returns an integer. VB.NET

Dim success As Boolean = False

'  This example demonstrates getting the completion value of a script,
'  where the last evaluated expression is an integer.

'  The Javascript run in this example is shown below.

'  Load the JavaScript from a file.
Dim sbScript As New Chilkat.StringBuilder
success = sbScript.LoadFile("js_eval_return_int.js","utf-8")
If (success = False) Then
    Debug.WriteLine(sbScript.LastErrorText)
    Exit Sub
End If


Dim js As New Chilkat.Js
Dim result As New Chilkat.JsonObject

'  Run the JavaScript
'  Eval returns the completion value of the script. This is generally the value of the last evaluated expression.
'  In this case, the last evaluated expression is an int.
success = js.Eval(sbScript,result)
If (success = False) Then
    Debug.WriteLine(sbScript.LastErrorText)
    Exit Sub
End If


result.EmitCompact = False
Debug.WriteLine(result.Emit())

'  Output:

'  {
'    "type": "int",
'    "value": 42
'  }

JavaScript

const base = 10;
const multiplier = 4;
const offset = 2;

// The last line is a calculation resulting in an integer
// Returns 42.
(base * multiplier) + offset;