(Objective-C) Eval JavaScript Returning String

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Note: This example requires Chilkat v11.4.0 or greater.

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#import <CkoStringBuilder.h>
#import <CkoJs.h>
#import <CkoJsonObject.h>

BOOL success = NO;

// 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.
CkoStringBuilder *sbScript = [[CkoStringBuilder alloc] init];
success = [sbScript LoadFile: @"js_eval_return_string.js" charset: @"utf-8"];
if (success == NO) {
    NSLog(@"%@",sbScript.LastErrorText);
    return;
}

CkoJs *js = [[CkoJs alloc] init];
CkoJsonObject *result = [[CkoJsonObject alloc] init];

// 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: result];
if (success == NO) {
    NSLog(@"%@",sbScript.LastErrorText);
    return;
}

result.EmitCompact = NO;
NSLog(@"%@",[result Emit]);

// Output:

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

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

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