(Node.js) Call a JavaScript Function Passing an Array Argument

See more JavaScript Examples

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

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    var success = false;

    // This is the JavaScript function we'll call:

    // function calculateTotal(numbers) {
    //   console.log(numbers);
    //   let total = 0;
    //   
    //   // Loop through every number in the array
    //   for (const num of numbers) {
    //     console.log(num);
    //     total += num;
    //   }
    //   
    //   return total;
    // }

    var sbScript = new chilkat.StringBuilder();
    success = sbScript.LoadFile("js_function_array_arg.js","utf-8");
    if (success == false) {
        console.log(sbScript.LastErrorText);
        return;
    }

    var js = new chilkat.Js();

    var result = new chilkat.JsonObject();
    result.EmitCompact = false;

    // Call Eval to add the function to the context's global object
    success = js.Eval(sbScript,result);
    if (success == false) {
        // Examine the result for an exception.
        console.log(result.Emit());

        // Also examine the LastErrorText.
        console.log(js.LastErrorText);
        return;
    }

    // ------------------------------------------------------------------------------
    // Call the function calculateTotal(numbers)

    var funcCall = new chilkat.JsonObject();
    funcCall.EmitCompact = false;

    // Create JSON specifying the function name and arguments
    // In this case, there is only 1 argument, and it is an array.

    funcCall.UpdateString("name","calculateTotal");

    // Create the arguments array.
    var argsArray = new chilkat.JsonArray();

    // The 1st argument in the arguments array is itself an array.
    // Passing -1 indicates to append to the array.
    var arg = new chilkat.JsonArray();
    argsArray.AddArrayAt2(-1,arg);

    // Fill in the values for the 1st argument.
    arg.AddNumberAt(-1,"10.50");
    arg.AddNumberAt(-1,"20.00");
    arg.AddNumberAt(-1,"5.25");

    // Add the "args" array to the funcCall.
    funcCall.AppendArrayCopy("args",argsArray);

    console.log(funcCall.Emit());

    // The funcCall is as follows.  Notice that the 1st (and only) argument is an array.

    // {
    //   "name": "calculateTotal",
    //   "args": [
    //     [
    //       10.50,
    //       20.00,
    //       5.25
    //     ]
    //   ]
    // }

    success = js.CallFunction(funcCall,result);
    if (success == false) {
        // Examine the result for an exception.
        console.log(result.Emit());

        // Also examine the LastErrorText.
        console.log(js.LastErrorText);
        return;
    }

    console.log(result.Emit());

    // Result:
    // {
    //   "type": "double",
    //   "value": 35.75
    // }

    // The function also emitted text to the console.

    var sbOut = new chilkat.StringBuilder();
    js.ConsoleOutputSb(sbOut);
    console.log(sbOut.GetAsString());

    // Output:
    // 10.5,20,5.25
    // 10.5
    // 20
    // 5.25

    // -----------------------------------------------------------
    // Note: If the array argument is simple, this is an alternative
    // and simpler way of creating the funcCall:

    funcCall.Clear();
    funcCall.UpdateString("name","calculateTotal");
    funcCall.UpdateNumber("args[0][0]","10.50");
    funcCall.UpdateNumber("args[0][1]","20.00");
    funcCall.UpdateNumber("args[0][2]","5.25");
    console.log(funcCall.Emit());

}

chilkatExample();

function calculateTotal(numbers) {
  console.log(numbers);
  let total = 0;
  
  // Loop through every number in the array
  for (const num of numbers) {
    console.log(num);
    total += num;
  }
  
  return total;
}