Programming Articles - Page 366 of 3366

In this golang article we will write a program to create directories recursively using os.MkdirAll() function as well as using recursion. One of the main use cases of Go is to create scalable and concurrent applications. Method 1 In this Example we will write a go language program to create directories recursively by using MkdirAll() function present in os package. The simplest way to create directories recursively in Golang is by using this function. This function takes a file path as an argument and creates all the missing directories in the path. Syntax funcMkdirAll(path string, perm FileMode) error The ... Read More

In this golang article, we can send email using SMTP’s SendMail method, as well as using SMTP with go mail method, SMTP stands for simple mail transfer protocol. This protocol is used to send messages between the servers. The net/smtp package provides a medium to send messages hence it must be imported in the program. Syntax smtp.PlainAuth() This function belongs to the smtp and is primarily used to authenticate with the SMTP server using plain authentication. smtp.SendMail() This function is present in the SMTP package. It is used to send the message from the SMTP server. smtpClient.Auth() ... Read More

In this Go language article, we will write programs to implement recursive anonymous function by generating fibonacci numbers, by using cache, as well as factorial of a number. An anonymous function is the function which does not have its name and it calls itself within its own body and when repeated calls are made, it called as recursive functions. Method 1 In this Example, we will generate Fibonacci numbers recursively by using an anonymous function. Here, fibo is assigned to the anonymous function with func and an input parameter. Algorithm Step 1 − Create a package main and declare ... Read More

In this golang article, we will learn the overview testing package using two test functions as well as using iteration. Testing is of two types: manual testing and automated testing, manual testing is done manually with defined set of test cases whereas in automated testing a program is created with code to test the software. Here we will use two test function as well as iteration method to show the importance of testing package. Algorithm Step 1 −Import the required packages in the program Step 2 − Create a test function in which the function will be called which ... Read More

In this golang article, we will write Go language programs to depict short variable declaration operator using var keyword and variable declaration. In shorthand variable, initialization is done at the time of declaration where it’s not necessary in var keyword. Here, we will use a string method, as well as a count variable method to depict short variable declaration. Algorithm Step 1 − Import the required packages in the program Step 2 − Create a main function Step 3 − In the main use short variable declaration to create strings Step 4 − Print the strings created via shorthand ... Read More

In Golang, os and io packages are used for performing various file-r operations like editing, copying, creating, and deleting. In this article, we are going to see three different Examples to create an empty file. In the first Example we will use os.Create from the os package, in the second Example we will use WriteFile function from ioutil package is used and in the third Example we will use NewWriter function from bufio package is used. Syntax os.Create() This function comes from the os package. It helps in the creation of a new file. The filename is given as ... Read More

In Go programming language, Bufio and io package functions will be used to read the text from the given file. In this article, we will use three Examples to read lines from the existing file. In the first Example, we will use NewReader function from the bufio package, in the second Example we will use ReadFile function from ioutil package and in the third Example we will use file.Read function respectively. Syntax func Split(str, sep string) []string Split() function is used to split a string through a provided separator. This function is present in strings package and it accepts ... Read More

In this Golang article we will use ReadFile function from the io/ioutil package, NewScanner function from the bufio packageand as well as NewReader function from the former package respectively to read entire text from the xis=sting file. Syntax bufio.NewReader() This function belongs to Go's bufio package. The primary goal of this function is to read the data in larger chunks instead of line by line and store in buffer. The io.reader and buffer size are passed as arguments in this function. os.Open() This function is a part of os package. It is used to open a file to ... Read More

In golang we can use ioutile.ReadFile() to read the file and for loop timer, we will limit the character numbers to read, Os.Open and bufio.NewReader function to perform the execution as well as file.Read() respectively. In this article we will learn how to use the OS asnd bufio package of Golang to read the specified number of characters from the existing file. Syntax ioutil.ReadFile(file) The ReadFile() function is present in ioutil package and is used to read the given file. The function accepts the file to be read as argument to the function. To read a specified number of ... Read More

In this golang article, we are going to use os.OpenFile() and ioutil.Readfile() to append the given file without truncating it. In the first Example, we are going to Os.Openfile to access the file and then by using file.WriteString function we will append it. In the second Example, we will use ioutil, ReadFile(), ioutil.WriteFile() and Append() functions to perform the same operation on the file without truncating it respectively. Syntax file.read() The Read() function is used to read the contents of a file. The function accepts the file whose contents are to be read as an argument and returns the ... Read More