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Programming Articles
Page 2121 of 2547
Find the Number of Pentagons and Hexagons on a Football using C++
As we all know, pentagons and hexagons are equally essential parts of football. These shapes fit together like a puzzle for forming a perfectly spherical shape. So here we have a football, in which we have to find the hexagons and pentagons.We will use the Euler characteristic to solve the problem easily. Euler characteristic is a number that works to describe a specific shape or structure of any topological space. So we can use it for calculating the number of Pentagons and Hexagons on the football.In Euler characteristics −chi(S) − Integer for a specific surface SF − facesG − GraphV ...
Read MoreNode.js – dns.lookupService() Method
The dns.lookupService() method resolves a given address and port into a hostname and service. This method uses the operating system's underlying getnameinfo implementation. A TypeError will be thrown if the address is not a valid IP address.Syntaxdns.lookupService(address, port, callback)Parametersaddress - This parameter takes input for the IP address that needs to be resolved.port - This parameter takes input for the port number that is attached with the IP address.callback - It will catch errors, if any.Example 1Create a file with the name "lookupService.js" and copy the following code. After creating the file, use the command "node lookupService.js" to run this ...
Read MoreFind the Number of Paths of Weight W in a K-ary tree using C++
In this article, we'll use C++ to calculate the number of weight W paths in a K-ary tree in this article. We've given a K-ary tree, which is a tree in which each node has K children and each edge has a weight assigned to it, with weights descending from 1 to K from one node to all of its children.We need to count the cumulative number of paths beginning from the root that have a weight of W and at least one edge with a weight of M. So, here's example −Input : W = 4, K = 3, ...
Read MoreNode.js – Process Warning Event
A 'warning' event is emitted whenever a Node.js event emits a process warning. The process warning is similar to an error that describes the exceptional conditions that are being brought to the user's attention.Node.js can emit warnings whenever it encounters any bad coding practices that could lead to poor performance or bugs.SyntaxEvent : 'warning'Example 1Create a file with the name "warning.js" and copy the following code. After creating the file, use the command "node warning.js" to run this code, as shown in the example below// Event: warning Demo Example // Importing the process module const process = require('process'); ...
Read MoreNode.js – Monitor mode in Redis
Redis also supports the monitor command that lets the user to see all the commands received by the Redis server across all the client connections. These connections include commands from everywhere, including other client libraries and computers as well.The monitor event will monitor all the commands which are executed on the Redis server where monitor is enabled. The callback from the monitor receives the timestamp from the Redis server, an array of commands along with the raw monitoring string.Syntaxclient.monitor( function(callback) )Example 1Create a file with the name "monitor.js" and copy the following code. After creating the file, use the command "node ...
Read MoreNode.js – stringDecoder.end() Method
The stringDecoder.end() method will return any remaining input that is left in the internal buffer as a string. Bytes that are left incomplete and represent UTF-8 and UTF-16 characters are replaced with the substitution characters appropriate for character encoding.StringDecoder.write() method is called before returning the remaining input if any buffer argument is provided. The stringDecoder can be reused for taking new inputs once the end() method is called.SyntaxstringDecoder.end( [buffer] )Parametersbuffer - This parameter takes input for the bytes to decode. It can take buffer, TypedArray or DataView as the input parameters.Example 1Create a file with the name "end.js" and copy ...
Read MoreNode.js – retry_strategy Property in Redis
The retry_strategy is a function that receives objects as parameters including the retry attempt, total_retry_time that indicates the time passed after it was connected the last time, the error due to which the connection was lost, and the number of times_connected in total.If a number is returned from this function, the next retry will take place after that time only in milliseconds and if you send a non-number, no further retry will take place.Syntaxretry_strategy: funciton(options)Example 1Create a file with the name "retryStrategy.js" and copy the following code. After creating the file, use the command "node retryStrategy.js" to run this code ...
Read MoreNode.js – dns.resolvePtr() Method
The dns.resolvePtr() method uses the DNS protocol to resolve the pointer records (PTR Records) for the hostname. The addresses argument passed to the callback function will contain the reply records as an array of strings.Syntaxdns.resolvePtr(hostname, callback)Parametershostname - This parameter takes the input for the hostname to be resolved.callback - This function will catch errors, if any.records − Returns PTR records for the hostname.Example 1Create a file with the name "resolvePtr.js" and copy the following code. After creating the file, use the command "node resolvePtr.js" to run this code as shown in the example below// dns.resolvePtr() Demo Example // Importing ...
Read MoreNode.js – dnsPromises.resolveSoa() Method
The dnsPromises.resolveSoa() method uses the DNS protocol to resolve the Start of Authority records (SOA Records) for the hostname. On success, the promise is resolved with the following propertiesnsnamehostmasterserialrefreshretryexpireminttlSyntaxdnsPromises.resolveSoa( hostname )Parametershostname - This parameter takes the input for the hostname to be resolved.Example 1Create a file with the name "resolveSoa.js" and copy the following code. After creating the file, use the command "node resolveSoa.js" to run this code as shown in the example below// dns.resolveSoa() Demo Example // Importing the dns module const dns = require('dns'); const dnsPromises = dns.promises; // Passing IP to find the hostname TXT ...
Read MoreNode.js – detect_buffers Property in Redis
Node.js Redis offers certain properties which can be used as per your usecase. One such property is detect_buffers.If this property is set to True, then the replies that are sent to the callbacks are sent as buffers.This option lets you switch between the buffer and strings based upon this single command basis.This property does not work with pub-sub mode.SyntaxdetectBuffers: trueExample 1Create a file with the name "detectBuffers.js" and copy the following code. After creating the file, use the command "node detectBuffers.js" to run this code, as shown in the example below:// detect_buffers Property Demo Example // Importing the redis ...
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