Perl

Eval JavaScript Returning Int

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

use chilkat();

$success = 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.
$sbScript = chilkat::CkStringBuilder->new();
$success = $sbScript->LoadFile("js_eval_return_int.js","utf-8");
if ($success == 0) {
    print $sbScript->lastErrorText() . "\r\n";
    exit;
}

$js = chilkat::CkJs->new();
$result = chilkat::CkJsonObject->new();

#  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 == 0) {
    print $sbScript->lastErrorText() . "\r\n";
    exit;
}

$result->put_EmitCompact(0);
print $result->emit() . "\r\n";

#  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;