This converts an array of strings (or 1-char strings which are like characters) into a string. Array, string. Ruby calls the to_s method on the string interpolation block, this tells the object to convert itself into a string. Ruby program that uses no delimiter values = [ "a" , "b" , "c" ] # Join with no delimiter. A negative index is assumed relative to the end of the array --- that is, an index of -1 indicates the last element of the array, -2 is the next to last element in the array, and so on. To transform the array of sharks into a string of shark names separated by spaces, you’d do something like this: Syntax: Array.insert() Parameter: Array index element. insert() is a Array class method which returns the array by inserting a given element at the specified index value. How to Extract a Substring A substring is a smaller part of a string, it’s useful if you only want that specific part, like the beginning, middle, or end. Learn to Use the Sort & Sort! Let’s look at an example: "" + 1 # TypeError: no implicit conversion of Fixnum into String … You’ll learn the different ways of sorting an array, starting with the sort method, then taking a look at sort_by for advanced sorting (by multiple values) & more. Return: insert elements the specific index value Example #1 : Ruby arrays are not as rigid as arrays in other languages. Every Ruby class (with the exception of BasicObject) implements the to_s method to return itself as some type of string representation. I do not need to do this often, but I have had a need to do this, largely due to file names on the *nix commandline that have ' ' characters (space), so I pad them via '"' like: foo bar.mp3 to become: "foo bar.mp3" The join method converts an array to a string, but gives you much more control of how you want the elements combined. The ‘reduce’ method can be used to take an array and reduce it to a single value. Returns a new array. Here We take an array of three characters, use join… In the first form, if no arguments are sent, the new array will be empty. The most basic form of sorting is provided by the Ruby sort method, which is defined by the Enumerable module. If you want to convert a string with numbers into an actual integer value you have to use the to_i method. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. Lets start with a simple demonstration of this method. Ruby Convert Types: Arrays and StringsCast and converts types: use methods to convert strings, arrays and hashes. A Computer Science portal for geeks. Remember : A method is a command you can give to any object in Ruby. Ruby arrays can hold objects such as String, Integer, Fixnum, Hash, Symbol, even other Array objects. Ruby Methods. The join method takes an argument that specifies the character you want to use as a separator. This is an ideal way to convert an array into a string. But just because a class returns a string doesn’t mean it behaves like a string! After joining the elements of an array into a string using Array#join, I frequently need to put substrings before and after the string. Let’s do this! The second form creates a copy of the array passed as a parameter (the array is generated by calling #to_ary on the parameter). Depending on the kind of object you’re working with they will respond to different methods. The join method combines elements of an array together into a new string. When a size and an optional default are sent, an array is created with size copies of default.Take notice that all elements will reference the same object default. A array class method which returns the array by inserting a given element at the specified index.. 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