Perl Requires Chilkat v11.4.0+

Eval JavaScript Returning String

See more JavaScript Examples

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

use strict;
use warnings;
use Chilkat2;

# This example demonstrates getting the completion value of a script,
# where the last evaluated expression is a string.

# The Javascript run in this example is shown below.

# Load the JavaScript from a file.
my $sbScript = Chilkat2::StringBuilder->new;
my $success = $sbScript->LoadFile('js_eval_return_string.js', 'utf-8');
if (!$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 a string.
$success = $js->Eval($sbScript, $result);
if (!$success) {
    print $js->LastErrorText, "\n";
    exit;
}

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

# Output:

# {
#   "type": "string",
#   "value": "Ready for Chilkat.Js"
# }

JavaScript

var status = "Ready";
var system = "Chilkat.Js";

// The last statement is an expression
status + " for " + system;