CkPython

Eval JavaScript Returning Int

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

import sys
import chilkat

success = False

#  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()
success = sbScript.LoadFile("js_eval_return_int.js","utf-8")
if (success == False):
    print(sbScript.lastErrorText())
    sys.exit()

js = chilkat.CkJs()
result = chilkat.CkJsonObject()

#  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 == False):
    print(sbScript.lastErrorText())
    sys.exit()

result.put_EmitCompact(False)
print(result.emit())

#  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;