If you want to write to a file using Ruby: Open the file in write mode (“w” flag) Use thewritemethod to add data to the file If you didn’t use the block version, remember toclose Example: File.open("log.txt", "w") { |f| f.write "#{Time.now} - User logged in\n" }...
When you run a program, you won’t see any indication of comments in the code; the Ruby interpreter ignores them entirely. Comments are in the source code for humans to read, not for computers to execute. In a simple Ruby program, like the one in the tutorialHow to Write Your First R...
In this example, converting the string"123-abc"to an integer results in the integer123. Theto_imethod stops once it reaches the first non-numeric character. Ruby web developers exploit this by creating URLs like15-sammy-shark, where15is an internal ID to look up a record, butsammy-sharkg...
Internedjava.lang.Stringobjects are also stored in the permanent generation. Thejava.lang.Stringclass maintains a pool of strings. When the intern method is invoked, the method checks the pool to see if an equivalent string is present. If so, it’s returned by the intern method; if not, ...
In this method, first, we call the open() function to open the desired file. After that, the print() function is used to print the text in the file by specifying the file=external_file parameter within the function.It is always the user’s choice to either use the w operator or the...
The console.log() function is a common way to print an object in JavaScript. This function will display/print the argument on a web console then a string can obtain as a result. Syntax: console.log(object); Let’s create an array called array that contains values: Sam and Roger and ...
Ruby is capable to handle any Runtime Exceptions if they create any error in the code and disturbs the flow of the program and these types of error may result in "index out of range exception", "divided by zero error" and so on. If these errors are not handled, the program execution...
Ruby Lane Facebook Marketplace Reach those shoppers by listing your products for sale there. Just bear in mind that each selling platform charges a transaction fee when you make a sale. Some may also charge a listing fee. Mitigate risk by adding an online marketplace as a secondary sales...
When working with objects in Ruby it’s helpful to know what class an object is made from. You can do that like this: "".class # String [].class # Array orange.class # Orange (assuming orange = Orange.new) Why is this useful?
/usr/bin/env ruby print "What is your name? " name = gets.chomp puts "Hello #{name}!" Open a command line window and navigate to your Ruby scripts directory using thecdcommand. Once there, you can list files, using thedircommand on Windows or thelscommand on Linux or OS X. Your...