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Articles by Mayank Agarwal
Page 26 of 31
Node.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 ...
Read MoreNode.js – util.promisify() Method
The util.promisify() method basically takes a function as an input that follows the common Node.js callback style, i.e., with a (err, value) and returns a version of the same that returns a promise instead of a callback.Syntaxutil.promisify(original)ParametersIt takes only one parameter −original −This parameter takes an input for the function and returns them as a promise.Example 1Create a file with the name "promisify.js" and copy the following code snippet. After creating the file, use the command "node promisify.js" to run this code.// util.promisify() Demo example // Importing the fs and util modules const fs = require('fs'); const util = ...
Read MoreNode.js – Retrieving file character encoding
A computer system works upon bits. In the same way, a computer reads files into binary representation which is why we need to convert text characters into binary data. Most popular character encoding types types are: ASCII and Unicode. Unicode has two further types: utf8 and utf16.SyntaxdetectCharacterEncoding(filePath)Setting Up the Environment and Execution:Step I − Initialize the node project.npm initStep II − Install the required modules.npm install detect-character-encodingStep III − Pass the text file name whose encoding is required.Example 1Create a file "abc.txt" with the following text: "Welcome to Tutorials Point" and save it in the project directory.Create a file with the name ...
Read MoreNode.js – util.types.isGeneratorFunction() Method
The util.types.isGeneratorFunction() method checks whether the passed value is a generator function or not. If the above condition holds, it returns True, else False. The return value may differ from the original source code if a transpilation tool is used.Syntaxutil.types.isGeneratorFunction(value)Parametersvalue − This input value takes input for the required parameter and checks if it's a Generator function or not.It returns True or False based upon the input value passed.Example 1Create a file with the name "isGeneratorFunction.js" and copy the following code snippet. After creating the file, use the command "node isGeneratorFunction.js" to run this code.// util.types.isGeneratorFunction() Demo Example // Importing ...
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