Lua 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. Lua

local chilkat = require("chilkat")

-- 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.
local sbScript = chilkat.StringBuilder.new()
local success = sbScript:load_file("js_eval_return_int.js", "utf-8")
if not success then
    print(sbScript.last_error_text)
    return
end

local js = chilkat.Js.new()
local result = chilkat.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 not success then
    print(sbScript.last_error_text)
    return
end

result.emit_compact = 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;