1 Answer. It’s the splat operator. You’ll often see it used to split an array into parameters to a function.
What does * do in Ruby?
The * is the splat operator. It expands an Array into a list of arguments, in this case a list of arguments to the Hash.  method. (To be more precise, it expands any object that responds to to_ary / to_a , or to_a in Ruby 1.9.)
What does Star do in Ruby?
This indicates that more parameters may be passed to the function. Those parameters are collected up and an array is created. The asterisk operator may also precede an Array argument in a method call. In this case the Array will be expanded and the values passed in as if they were separated by commas.
What does .first do in Ruby?
The first() is an inbuilt method in Ruby returns an array of first X elements. If X is not mentioned, it returns the first element only. … Return Value: It returns an array of first X elements.
What is * args in Ruby?
In the code you posted, *args simply indicates that the method accepts a variable number of arguments in an array called args . It could have been called anything you want (following the Ruby naming rules, of course). … ARGV contains the arguments passed to your script, one per element.
What does .freeze do in Ruby?
The freeze method in Ruby is used to ensure that an object cannot be modified. This method is a great way to create immutable objects. Any attempt to modify an object that has called the freeze method will result in the program throwing a runtime error.
Is Star Ruby man made?
Synthetic (i.e. Lab-made / Man-made) star rubies jump out as way too perfect looking, i.e. a perfect star, a super clean stone, and great color. If you run into any such stone, be sure to ask for a Reputed Gem Laboratory certificate.
How do you find the star in Ruby?
How to identify synthetic star rubies?
- First look for imperfections within the stone. Unevenness on the bottom, also stripes or lines of color.
- It shows through the top. …
- It shows through the top.
- Almost all natural star rubies have one or more of these natural imperfections.
- Then look at the star itself.
What is slice in Ruby?
#slice is a method that operates on arrays, strings, and (since Ruby 2.5. 0) hashes. We’ll just focus on arrays for now, since the logic is basically the same regardless, but keep in mind that you can call #slice on strings and hashes as well. #slice allows you to cut into an array and select specific elements.
What does .shift do in Ruby?
Ruby | Array shift() function
Array#shift() : shift() is a Array class method which removes the first element of self and returns it or nil if the array is empty. Return: removes the first element of self and returns it or nil if the array is empty.
What is string interpolation in Ruby?
String Interpolation, it is all about combining strings together, but not by using the + operator. String Interpolation works only when we use double quotes (“”) for the string formation. String Interpolation provides an easy way to process String literals.
What is splat in Ruby?
Splat operator or start (*) arguments in Ruby define they way they are received to a variable. Single splat operator can be used to receive arguments as an array to a variable or destructure an array into arguments. Double splat operator can be used to destructure a hash.
How do I use a variable in Ruby?
Ruby Class Variables
Class variables begin with @@ and must be initialized before they can be used in method definitions. Referencing an uninitialized class variable produces an error. Class variables are shared among descendants of the class or module in which the class variables are defined.
What is a class in Ruby?
Ruby is an ideal object-oriented programming language. … A class is a blueprint from which objects are created. The object is also called as an instance of a class. For Example, the animal is a class and mammals, birds, fish, reptiles, and amphibians are the instances of the class.