How to use prototype pattern in javascript?

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I have a simple scenario as below :

On HTML page, there is a simple table which displays a list of items. This grid has select all checkbox like functionality.

When use click checkbox, all the items in the grid should be selected.

I am using below script for start:

(function (window, $) {

    var UnfreezeTest = function () {
        return new UnfreezeTest.init();
    }

    //Create prototype to add new methods here 

    UnfreezeTest.prototype = {
        selectAll: function (chkAllElement) {
            $(".js-chk input[type='checkbox']").attr("checked", chkAllElement.checked);
        },
        reset: function () { 

        }
    };

    UnfreezeTest.init = function () {
        //Initialize any object here 
        //Example 
        //this.propertyName = value;
    }

    //Assign prototype for newly created object to point to the methods
    UnfreezeTest.init.prototype = UnfreezeTest.prototype;

    window.UnfreezeTest = UnfreezeTest;


} (window, jQuery));

I do not want to use new operator while creating an object.

I want to use as below:

var obj = UnfreezeTest();

Is there any suggestion or am I doing it right?


if I understand correctly, in order to create instances of your prototypes I think you want something more like the following:

var UnfreezeTest = function (tableId) {
	this.tableId = tableId;
}

UnfreezeTest.prototype = {
	selectAll: function (chkAllElement) {
		$('#' + this.tableId + " .js-chk input[type='checkbox']").attr("checked", chkAllElement.checked);
	},
	reset: function () { 

	}
};

var unfreeze1 = new UnfreezeTest('myTable1');
unfreeze1.selectAll();


var unfreeze2 = new UnfreezeTest('myTable2');
unfreeze2.selectAll();

The Prototype Pattern in JavaScript - DEV Community ‍ ‍ , It sounds like typical class objects, but in reality it avoids using classes altogether. The prototype design pattern simply creates copies of  The objects participating in this pattern are: Client -- In sample code: the run() function. creates a new object by asking a prototype to clone itself. Prototype -- In sample code: CustomerPrototype creates an interfaces to clone itself. Clones -- In sample code: Customer the cloned objects that are being created.


The Prototype Pattern in JavaScript - Better Programming, The Prototype Pattern in JavaScript. Creational Design Patterns: Instead of having to directly instantiate objects, these patterns create them for you. Behavioral Design Patterns: These patterns are focused on the communication between objects. Structural Design Patterns: These patterns focus on class and object All JavaScript objects inherit properties and methods from a prototype: Date objects inherit from Date.prototype; Array objects inherit from Array.prototype; Person objects inherit from Person.prototype; The Object.prototype is on the top of the prototype inheritance chain: Date objects, Array objects, and Person objects inherit from Object.prototype.


If the only aim is to be able to create an instance of that calls with and without new then you can do it that way:

function UnfreezeTest(tableId) {
  // check if this is an instance of UnfreezeTest
  if( !(this instanceof UnfreezeTest) ) {
    // if it is not then the function was not invoked with new so create an instance
    return new UnfreezeTest(tableId) 
  }
  this.tableId = tableId;
}

UnfreezeTest.prototype = {
  selectAll: function (chkAllElement) {
    $('#' + this.tableId + " .js-chk input[type='checkbox']").attr("checked", chkAllElement.checked);
  },
  reset: function () { 

  }
};


console.dir(UnfreezeTest(1234))
console.dir(new UnfreezeTest(1234))

The Prototype Pattern, We can think of the Prototype pattern as being based on prototypal inheritance in which we create objects that act as prototypes for other objects. The prototype object itself is effectively used as a blueprint for each object the constructor creates. The original function-based calculator code shown earlier can be refactored to follow the Prototype Pattern as shown shown next. A prototype is created for the Calculator object and functions/properties are defined within the prototype using JavaScript object literal syntax. Calculator.prototype = {add: function (x, y) {return x + y;},


Another pattern you can use, which doesn't require a prototype or the word 'new' is the following:

function UnfreezeTest(tableId) {
	var tableId = tableId;
	var obj = {
		selectAll: function (chkAllElement) {
			$('#' + tableId + " .js-chk input[type='checkbox']").attr("checked", chkAllElement.checked);
		},
		reset: function () { 

		}
	};
	return obj;
}

var unfreeze = UnfreezeTest(tableId);

Using Prototypes in Javascript, What is prototype in JavaScript and how do you use it? To start using the Prototype Pattern you need to first create a constructor as shown next. The constructor can accept one or more parameters and define any variables that the object needs. Note that the variables are scoped to the object rather than to the global scope.


Prototype in JavaScript, Framework, a unique guide for web app developers and architects. One of the benefits of using the Prototype pattern is that we’re working with the prototypal strengths JavaScript has to offer natively rather than attempting to imitate features of other languages. With other design patterns, this isn’t always the case.


JavaScript Design Patterns, There are many ways to structure JavaScript code using various design patterns in an effort to produce software that is easier to reason about as well as  To solve this issue, you use the prototype pattern. Prototype pattern. The prototype pattern adds the properties of the object to the prototype object. Then, these properties are available and shared among all instances. The following example uses the prototype pattern to rewrite the Animal object above.


JavaScript Prototype Pattern – Vegibit, The Prototype design pattern relies on the JavaScript prototypical inheritance. The prototype model is used mainly for creating objects in performance-intensive situations. The objects created are clones (shallow clones) of the original object that are passed around. The prototype pattern is a creational design pattern. Prototype patterns is required, when object creation is time consuming, and costly operation, so we create object with existing object itself. One of the best available way to create object from existing objects are clone() method. Clone is the simplest approach to implement prototype pattern.