Objective-C

Eval JavaScript Returning Int

See more JavaScript Examples

Demonstrates getting the completion value of a JavaScript that returns an integer. Objective-C

#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 an integer.

// 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_int.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 an int.
success = [js Eval: sbScript result: result];
if (success == NO) {
    NSLog(@"%@",sbScript.LastErrorText);
    return;
}

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

// Output:

// {
//   "type": "int",
//   "value": 42
// }