Perl Requires Chilkat v11.4.0+

Eval JavaScript Returning Int

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Demonstrates getting the completion value of a JavaScript that returns an integer. Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

# 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.
my $sbScript = Chilkat2::StringBuilder->new;
my $success = $sbScript->LoadFile('js_eval_return_int.js', 'utf-8');
if (!$success) {
    print $sbScript->LastErrorText, "\n";
    exit;
}

my $js = Chilkat2::Js->new;
my $result = Chilkat2::JsonObject->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) {
    print $sbScript->LastErrorText, "\n";
    exit;
}

$result->EmitCompact(0);
print $result->Emit(), "\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;