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Technical articles with clear explanations and examples
Running Java in Node.js
Node.js is an event-driven JavaScript runtime platform that is built using the Chrome’s V8 JavaScript engine. Node is mainly used for building large-scale applications. In this article, we will see how to run a Java code in Node.js.StepsCheck if Node.js is already installed on your system using the following command −npm initInstall Java on your local system as npm packagenpm install java Ensure that Java is already installed on your system. If not, you need to install Java on your system before running the following code.Example 1Create a file with the name "runJava.js" and copy the following code snippet. After ...
Read MoreGiving Input to a Node.js Application
The main aim of a Node.js application is to work as a backend technology and serve requests and return response. But we can also pass inputs directly to a Node.js application.We can use readline-sync, a third-party module to accept user inputs in a synchronous manner.Syntaxnpm install readline-syncThis will install the readline-sync module dependency in your local npm project.Example 1Create a file with the name "input.js" and copy the following code snippet. After creating the file, use the command "node input.js" to run this code.//Giving Input to a Node.js application Demo Example // Importing the realine-sync module const readline = ...
Read MoreSetting the font color & style of the console in Node.js
You can use the chalk module to customize the statements printed on the console.By using it, one can change the text font-color to any color. One can also change the font-style to Bold, Italic or Underlined. Also, you can highlight the printed text.Syntaxnpm install chalkExample 1Create a file "color.js" and copy the following code snippet. After creating the file, use the command "node color.js" to run this code.// Giving color to console statments // Importing the chalk module const chalk = require('chalk'); // Printing the text in blue color console.log(chalk.blue('Welcome to Tutorials Point !')); // Printing the ...
Read MoreNode.js – util.types.isNativeError() Method
The util.types.isNativeError() method checks whether the passed value is a built-in error type or not. If the above condition is satisfied, it returns True, else False. The error can be of any type.Syntaxutil.types.isNativeError(value)ParametersIt takes a single parameter −value − This input value takes input for the required parameter and checks if it's an error type or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isNativeError.js" and copy the following code snippet. After creating the file, use the command "node isNativeError.js" to run this code.// util.types.isNativeError() Demo Example // Importing the ...
Read MoreNode.js – util.types.isAnyArrayBuffer() Method
The util.types.isAnyArrayBuffer() checks whether the passed value is an ArrayBuffer or a SharedArrayBuffer instance. It returns True if the above condition holds, else False.Syntaxutil.types.isAnyArrayBuffer(value)ParametersIt takes a single parameter −value − This input parameter takes input for the required datatype and checks if it's an ArrayBuffer or SharedArrayBuffer instance.It returns True or False based upon the input value passed.Example 1Create a file with the name "isArrayBuffer.js" and copy the following code snippet. After creating the file, use the command "node isArrayBuffer.js" to run this code// util.types.isAnyArrayBuffer() Demo Example // Importing the util module const util = require('util'); // Printing ...
Read MoreNode.js – util.types.isDate() Method
The util.types.isDate() method checks whether the passed value is a built-in Date instance or not. If the above condition is satisfied, it returns True, else False.Syntaxutil.types.isDate(value)ParametersIt takes a single parameter −value − This input value takes input for the required parameter and checks if it's a Date instance or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isDate.js" and copy the following code snippet. After creating the file, use the command "node isDate.js" to run this code.// util.types.isDate() Demo Example // Importing the util module const util = require('util'); ...
Read MoreNode.js – util.getSystemErrorName() Method
The util.getSystemErrorName() method is used for returning the string name of the numeric error code that is returned from the Node.js API. There is a mapping between the error codes and error names which is platform-dependent.Syntaxutil.getSystemErrorName(err)ParametersIt takes a single parameter −err −This parameter takes input as a numeric value that will specify the error number or the error code.The function returns the error name based upon the error code or error number passed in the err parameter.Some common system errors are - EACCES, EEXIST, EISDIR, ENOENT, ENOTDIR, ENOTEMPTY, etc. Browse this page to find the complete information about system error ...
Read MoreNode.js – util.types.isProxy() Method
The util.types.isProxy() method checks whether the passed value is a built-in Proxy instance or not. If the above condition is satisfied, it returns True, else False.Syntaxutil.types.isProxy(value)ParametersIt takes only one parameter −value − This input value takes input for the required parameter and checks if it is a Proxy instance or not.It returns True or False based upon the input value passed.Example 1Create a file "isProxy.js" and copy the following code snippet. After creating the file, use the command "node isProxy.js" to run this code.// util.types.isProxy() Demo Example // Importing the util module const util = require('util'); // Defining ...
Read MoreNode.js – util.types.isArrayBufferView() Method
The util.types.isArrayBufferView() checks whether the passed value is an instance of the ArrayBuffer views, or typed array objects like DataView. This method returns True if the above conditions are satisfied, else it returns False.Syntaxutil.types.isArrayBufferView(value)ParametersIt takes only one parameter −value − This input parameter takes input for the required datatype and checks if it is an ArrayBuffer or a typed array objectIt returns True or False based upon the input value passed.Example 1Create a file with the name "isArrayBufferView.js" and copy the following code snippet. After creating the file, use the command "node isArrayBufferView.js" to run this code.// util.types.isArrayBufferView() Demo Example ...
Read MoreNode.js – util.types.isAsyncFunction() Method
The util.types.isAsyncFunction() checks whether the passed value is an async function or not. If the above condition holds, it returns True, else False.Syntaxutil.types.isAsyncFunction(value)ParametersIt takes only one parameter −value − This input value takes input for the required parameter and checks if it is an async function or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isAsyncFunction.js" and copy the following code snippet. After creating the file, use the command "node isAsyncFunction.js" to run this code.// util.types.isArgumentsObject() Demo Example // Importing the util module const util = require('util'); // Passing ...
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