Swift

Eval JavaScript Returning Int

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

func chilkatTest() {
    var success: Bool = 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.
    let sbScript = CkoStringBuilder()!
    success = sbScript.loadFile(path: "js_eval_return_int.js", charset: "utf-8")
    if success == false {
        print("\(sbScript.lastErrorText!)")
        return
    }

    let js = CkoJs()!
    let result = CkoJsonObject()!

    //  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(jscript: sbScript, result: result)
    if success == false {
        print("\(sbScript.lastErrorText!)")
        return
    }

    result.emitCompact = false
    print("\(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;