An enumerable object can be converted to set using the to set.
Ruby set add array.
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.
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Methods the original array will be modified.
Next let s look at how to sort the values of an array.
This is a hybrid of array s intuitive inter operation facilities and hash s fast lookup.
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Ruby arrays are not as rigid as arrays in other languages.
Here s an example of an array that contains a string a nil value an integer and an array of strings.
In the first form if no arguments are sent the new array will be empty.
Sorting data is a common practice.
The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter.
Usr bin env ruby array array new 3 times do str gets chomp array push str end use an array literal to store known information another use of arrays is to store a list of things you already know when you write the program such as the days of the week.
Arrays are often used to group together lists of similar data types but in ruby arrays can contain any value or a mix of values including other arrays.
Given an array of strings you could go over every string make every character uppercase.
The find all method is an alias for select but there is no find all.
However if you use the select.
You could convert them into a list of their corresponding email addresses phone number or any other attribute defined on the user class.
Map is a ruby method that you can use with arrays hashes ranges.
Tiger select and reject both return a new array leaving the original array unchanged.
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There are many ways to create or initialize an array.
Set implements a collection of unordered values with no duplicates.
Set is easy to use with enumerable objects implementing each most of the initializer methods and binary operators accept generic enumerable objects besides sets and arrays.
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Ruby arrays grow automatically while adding elements to them.
Returns a new array.
