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To convert a string in to date object Date() method should be used. This method creates a date instance that represents a single moment in time in a platform-independent format.ExampleIn the following example a string named "str" is initially parsed using JSON.parse() method and then converted in to date object using Date() method.Live Demo var str = '{"name":"Ram", "DOB":"1980-11-1", "country":"India"}'; var dateObj = JSON.parse(str); dateObj.DOB = new Date(dateObj.DOB); document.write(dateObj.DOB); OutputThu Nov 01 0198 00:00:00 GMT+0553 (India Standard Time)
We can use PHP ZipArchive class in order to zipping and unzipping the folder in PHP. As of PHP 5.3, this class is inbuilt. For using in windows users need to enable php_zip.dll inside of php.ini.Example
Accessing nested json objects is just like accessing nested arrays. Nested objects are the objects that are inside an another object.In the following example 'vehicles' is a object which is inside a main object called 'person'. Using dot notation the nested objects' property(car) is accessed.Example-1Live Demo var person = { "name":"Ram", "age":27, "vehicles": { "car":"limousine", "bike":"ktm-duke", "plane":"lufthansa" } } document.write("Mr Ram has a car called" + " " + person.vehicles.car); ... Read More
GZIP Compression is a simple, effective way to save bandwidth and speed up PHP application. The mechanism runs behind the GZIP compression is described below −Step1The browser/client request for a file to the server.Step2The server sends a .zip file to the browser (index.html.zip) rather than plain old index.html in response, due to which the download time and bandwidth decreases.Step3After the execution of the above step, the browser downloads the zipped file, extracts it, and then shows it to the user. This loads the webpage very quickly.In the Apache server, we have to Add the following to .htaccess file to enable ... Read More
Singleton Pattern ensures that a class has only one instance and provides a global point to access it. It ensures that only one object is available all across the application in a controlled state. Singleton pattern provides a way to access its only object which can be accessed directly without the need to instantiate the object of the class.ExampleOutputconnection createdExplanationIn the above example as we are following a singleton pattern so the object $db2 can't be created. Only a single object will be created and i.e available all across the application.
PHP 7 has added a new operator double question mark (??) operator. In PHP 7, the double question mark(??) operator known as Null Coalescing Operator.It returns its first operand if it exists and is not NULL; otherwise, it returns its second operand. It evaluates from left to right. Null Coalescing operator also can be used in a chain format.Let's take the below example to demonstrate the double question mark (??) operator.ExampleOutput9ExampleOutput34
Object.isFrozen()Object.isFrozen() method is used to find whether an object is frozen or not. An object is frozen if it followed the below criteriaIt should not be extensible.Its properties should be non-configurable.It shouldn't accept any new properties.SyntaxObject.isFrozen(obj);Parameters - Object.isFrozen() accepts an object as a parameter and scrutinizes whether it is frozen or not and returns a boolean output.ExampleIn the following example Object.isFrozen() scrutinizes whether the object 'obj' is frozen or not. Since the object is not frozen, false will be displayed as the output. Live Demo var object = { prop1 : 5 } var res = Object.isFrozen(object); ... Read More
An object property can be accessed in two ways. One is .property and the other is [property].Syntax-1Object.property;Syntax-2Object["property"];For better understanding, lets' look at the following example.In the following example an object called 'person' is defined and its properties were accessed in a dot notation.ExampleLive Demo var person = { firstname:"Ram", lastname:"kumar", age:50, designation:"content developer" }; document.write(person.firstname + " " + "is in a role of" + " " + person.designation); OutputRam is in a role of content developerIn the following example the properties of an object 'person' were accessed in bracket notation.ExampleLive Demo ... Read More
This example demonstrate about How to sort volley elements in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken text view to show sorted volley elements.Step 3 − Add the following code to src/MainActivity.javapackage com.example.myapplication; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.widget.TextView; import android.widget.Toast; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.StringRequest; import com.android.volley.toolbox.Volley; import org.json.JSONArray; import org.json.JSONException; ... Read More
In javascript, arrays are not true arrays. They are javascript objects. So when we try to know their type using typeof() operator the displayed output will be object.Syntaxtypeof(operand);parameters - typeof() operator takes an operand and returns the data type of the operand. In the following example even though variable 'a' is an array, the typeof() operator returns the output as object because in general every array is an object.ExampleLive Demo var a = [1, 2, 5, "hello"]; document.write(typeof(a)); var b = {}; document.write(""); document.write(typeof(b)); Outputobject objectUnlike typeof() operator, Array.isArray() checks whether the passed parameter ... Read More