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.
Ruby set add array.
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You could convert them into a list of their corresponding email addresses phone number or any other attribute defined on the user class.
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.
Here s an example of an array that contains a string a nil value an integer and an array of strings.
The main use for map is to transform data.
In the first form if no arguments are sent the new array will be empty.
Tiger select and reject both return a new array leaving the original array unchanged.
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.
An enumerable object can be converted to set using the to set.
Methods the original array will be modified.
One way is with the new class method names array new you can set the size of an array at the time of creating array names array new 20 the.
Map is a ruby method that you can use with arrays hashes ranges.
Ruby arrays grow automatically while adding elements to them.
Sorting data is a common practice.
Returns a new 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.
Next let s look at how to sort the values of an array.
However if you use the select.
This is a hybrid of array s intuitive inter operation facilities and hash s fast lookup.
Set implements a collection of unordered values with no duplicates.
Given an array of strings you could go over every string make every character uppercase.
Or if you have a list of user objects.
The find all method is an alias for select but there is no find all.
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Ruby arrays are not as rigid as arrays in other languages.
