Pass an extra argument to a callback function

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I have a function callWithMagic which takes a callback function as a parameter and calls it with one argument.

const callWithMagic = callback => {
  const magic = getMagic();
  callback(magic);
};

I also have a function processMagic which takes two arguments: magic and theAnswer.

const processMagic = (magic, theAnswer) => {
  someOtherMagic();
};

I want to pass the function processMagic as an argument to callWithMagic, but I also want to pass 42 as the second parameter (theAnswer) to processMagic. How can I do that?

callWithMagic(<what should I put here?>);

Just create a wrapper callback:

callWithMagic(function(magic) {
  return processMagic(magic, 42);
});

Or using ECMAScript 6 arrow functions:

callWithMagic(magic => processMagic(magic, 42));

Callback function, At some point, filter just calls the callback and passes the current element of the array. So it's a function calling another function, in this case the callback you pass as argument. The second parameter of filter will set this inside of the callback. Passing Arguments to Callbacks When binding events to callback, wxPython expects the call back to be a function that takes a single argument: the event object. There are often times when one might want to pass additional information into a callback function.


You could use an anonymus function

something like

session.sub('Hello', function(){marketEvents(your args);});

Understand JavaScript Callback Functions and Use Them , By default you cannot pass arguments to a callback function. For example: Pass an extra argument to a callback function I have a function callWithMagic which takes a callback function as a parameter and calls it with one argument.


You can create a function which calls the marketEvent function. No need to complicate things

session.sub('Hello', function(args, kwargs) {
    marketEvent(args, kwargs, 'my custom data');
});

otherwise you can do this:

var mrktEvent = function(customArgs) {
    return function(args, kwargs) { 
        marketEvent(args, kwargs, customArgs) 
    };
}

session.sub('Hello', mrktEvent("customEvent"));

How do I pass an extra parameter to the callback function in , It's common to need to pass extra information to a callback method, but since all callback methods have only one parameter (the return code from the remote  Adding extra arguments into a callback function is not possible in App Designer. However, you can share the data to callback functions as application state since "app" is accessible.


You can bind argument object to callback function:

var varObject = {var1: "findButton", var2: true};

function cbFunc() {
    console.log(this.var1+ ":" + this.var2);
}

//Example callback
datatable.ajax.reload(cbFunc.bind(varObject));

Passing arguments to callback functions, A higher order function is a function that accepts another function as an argument​. A callback function is a lucky function that gets passed into  Pass an extra argument to a callback function (4 answers) Closed 3 years ago . I have an array and now I want to execute a function on every element in the array.


Passing extra data to callbacks and scoping issues within the , “geekTwo” moves the argument it accepted to the function to passed it to. “​geekOne” is the callback function in this case. Example: filter_none. Whenever the callback executes as a result of the specific triggering action, MATLAB calls the callback function and passes these two arguments to the function . For example, define a callback function called lineCallback for the lines created by the plot function.


Mastering 'this' in JavaScript: Callbacks and bind(), apply(), call , Wanted to explain the power of callbacks so gave only one restriction. The function which is used for the searching user with the name given  A JavaScript closure is required to pass extra data to a callback or exception handler prior to the 3.0 release. For example, your callback method needs to look something like this: function callbackFunc(dataFromServer, dataFromBrowser) { // do something with dataFromServer and dataFromBrowser


JavaScript, Because JavaScript functions are first-class objects, you can pass functions to other functions as variables; The method of passing in functions as parameters to​  Closures are functions that refer to independent (free) variables. In other words, the function defined in the closure ‘remembers’ the environment in which it was created. Check MDN Documentation to learn more. So this way the arguments x and y are in scope of the callback function when it is called. Another method to do this is using the