Lianja

Eval JavaScript Returning Int

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

llSuccess = .F.

//  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.
loSbScript = createobject("CkStringBuilder")
llSuccess = loSbScript.LoadFile("js_eval_return_int.js","utf-8")
if (llSuccess = .F.) then
    ? loSbScript.LastErrorText
    release loSbScript
    return
endif

loJs = createobject("CkJs")
loResult = createobject("CkJsonObject")

//  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.
llSuccess = loJs.Eval(loSbScript,loResult)
if (llSuccess = .F.) then
    ? loSbScript.LastErrorText
    release loSbScript
    release loJs
    release loResult
    return
endif

loResult.EmitCompact = .F.
? loResult.Emit()

//  Output:

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


release loSbScript
release loJs
release loResult

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;