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ClosureOne of the strengths of javascript is closures. Javascript allows nested functions, a function inside a function, to access the variables of parent functions. This process of accessing outer function's variable by an inner function is called a closure. A memory leak occurs when a declared variable is automatically available to the inner nested function and resides in a memory despite it is not referenced in the inner nested function.In the following example 'childFunction' is the inner function defined within the 'parentFunction' the outer function. When a call is made to 'parentFunction' with a parameter "outer val", the outer variable ... Read More
You can use $pull operator to remove a string from an array. Let us first create a collection with documents −> db.removeAStringDemo.insertOne({"Score":[45, 67, 89, "John", 98, 99, 67]}); { "acknowledged" : true, "insertedId" : ObjectId("5cda5224b50a6c6dd317adbd") }Following is the query to display all documents from a collection with the help of find() method −> db.removeAStringDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cda5224b50a6c6dd317adbd"), "Score" : [ 45, 67, 89, "John", 98, 99, 67 ] ... Read More
A circle inscribed in a square is a circle which touches the sides of the circle at its ends. I.e. the diameter of the inscribed circle is equal to the side of the square. The area can be calculated using the formula “((丌/4)*a*a)” where ‘a’ is the length of side of square.Logic of the Code - The area of circle inscribed inside the circle is calculated using the formula ((丌/4)*a*a) for this we need to define the value of pie (丌) that mathematically is 22/7 or 3.14. The expression that evaluates to the result is saved in a float variable.Example Live ... Read More
The HTML DOM Input Date Object represents an input HTML element with type date.SyntaxFollowing is the syntax −Creating an with type datevar dateObject = document.createElement(“input”); dateObject.type = “date”;AttributesHere, “dateObject” can have the following attributes −AttributesDescriptionautocompleteIt defines the value of autocomplete attribute of a date fieldautofocusIt defines if the date field should be focused on initial page load.defaultValueIt sets/returns the default value of date fielddisabledIt defines if date field is disabled/enabledformIt returns a reference of enclosing form that contains the date fieldmaxIt returns/sets the value of max attribute of date fieldminIt returns/sets the value of min attribute of date fieldnameIt ... Read More
BeautifulSoup is a class in the bs4 module of python. Basic purpose of building beautifulsoup is to parse HTML or XML documents.Installing bs4 (in-short beautifulsoup)It is easy to install beautifulsoup on using pip module. Just run the below command on your command shell.pip install bs4Running above command on your terminal, will see your screen something like -C:\Users\rajesh>pip install bs4 Collecting bs4 Downloading https://files.pythonhosted.org/packages/10/ed/7e8b97591f6f456174139ec089c769f89a94a1a4025fe967691de971f314/bs4-0.0.1.tar.gz Requirement already satisfied: beautifulsoup4 in c:\python\python361\lib\site-packages (from bs4) (4.6.0) Building wheels for collected packages: bs4 Building wheel for bs4 (setup.py) ... done Stored in directory: C:\Users\rajesh\AppData\Local\pip\Cache\wheels\a0\b0\b2\4f80b9456b87abedbc0bf2d52235414c3467d8889be38dd472 Successfully built bs4 Installing collected packages: bs4 Successfully installed bs4-0.0.1To verify, ... Read More
Here we will see one interesting problem. In this problem, we will see how to print Christmas tree randomly. So the tree will be flickering like Christmas tree lights.To print a Christmas tree, we will print pyramids of various sizes just one beneath another. For the decorative leaves a random character is printed from a given list of characters. The height and randomness is adjustable.Here after generating a tree, the whole screen is cleared, then generate again, that’s why this is looking like flickering tree.Example#include #include #include #include #define REFRESH_RATE 40000 #define RANDOM_NESS 5 // The ... Read More
This example demonstrate about How to make an icon in the action bar with the number of notifications in AndroidStep 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. ... Read More
You can use $set operator for this. Let us first create a collection with documents −> db.updateSubObjectDemo.insertOne( ... { ... ... "ClientId" : 100, ... "ClientDetails" : { ... "ClientFirstName" : "Adam" ... } ... } ... ); { "acknowledged" : true, "insertedId" : ObjectId("5cd31434b64f4b851c3a13e9") }Following is the query to display all documents from a collection with the help of find() method −> db.updateSubObjectDemo.find().pretty();This will produce the following output −{ "_id" : ObjectId("5cd31434b64f4b851c3a13e9"), "ClientId" : 100, "ClientDetails" : { ... Read More
You can use $set operator for this. Following is the syntax −db.yourCollectionName.update({"_id" : yourObjectId }, {$set: { "yourOuterFieldName.anyInnerFieldName": yourValue}});Let us first create a collection with documents −> db.pushNewKeyDemo.insertOne({"UserId":100, "UserDetails":{}}); { "acknowledged" : true, "insertedId" : ObjectId("5cda58f5b50a6c6dd317adbf") }Following is the query to display all documents from a collection with the help of find() method −> db.pushNewKeyDemo.find();This will produce the following output −{ "_id" : ObjectId("5cda58f5b50a6c6dd317adbf"), "UserId" : 100, "UserDetails" : { } }Following is the query to push new key element into subdocument of MongoDB −> db.pushNewKeyDemo.update({"_id" : ObjectId("5cda58f5b50a6c6dd317adbf")}, {$set: { "UserDetails.UserName": "David Miller"}}); WriteResult({ "nMatched" : 1, ... Read More
A circumcircle is a circle that inscribes a regular polygon inside it. The triangle that is inscribed inside a circle is an equilateral triangle. Area of circumcircle of can be found using the following formula, Area of circumcircle = “(a * a * (丌 / 3))”Code Logic, The area of circumcircle of an equilateral triangle is found using the mathematical formula (a*a*(丌/3)). The value of 丌 in this code is coded as 3.14. The expression is evaluated into a float value.Example Live Demo#include #include int main(){ int a = 5; float area; float pie = 3.14; ... Read More