Xbase++ Requires Chilkat v11.4.0+

Eval JavaScript Returning Int

See more JavaScript Examples

Demonstrates getting the completion value of a JavaScript that returns an integer. Xbase++

LOCAL nSuccess
LOCAL oSbScript
LOCAL oJs
LOCAL oResult

nSuccess := 0

//  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.
oSbScript := CreateObject("Chilkat.StringBuilder")
nSuccess := oSbScript:LoadFile("js_eval_return_int.js", "utf-8")
IF (nSuccess == 0)
    ? oSbScript:LastErrorText
    oSbScript:destroy()
    RETURN
ENDIF

oJs := CreateObject("Chilkat.Js")
oResult := CreateObject("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.
nSuccess := oJs:Eval(oSbScript, oResult)
IF (nSuccess == 0)
    ? oSbScript:LastErrorText
    oSbScript:destroy()
    oJs:destroy()
    oResult:destroy()
    RETURN
ENDIF

oResult:EmitCompact := 0
? oResult:Emit()

//  Output:

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

oSbScript:destroy()
oJs:destroy()
oResult:destroy()

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;