Sorting data is a common practice.
Ruby set add array.
Map is a ruby method that you can use with arrays hashes ranges.
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The main use for map is to transform data.
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.
However if you use the select.
The find all method is an alias for select but there is no find all.
Here s an example of an array that contains a string a nil value an integer and an array of strings.
Or if you have a list of user objects.
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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.
Methods the original array will be modified.
An enumerable object can be converted to set using the to set.
The second form creates a copy of the array passed as a parameter the array is generated by calling to ary on the parameter.
There are many ways to create or initialize an array.
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Set implements a collection of unordered values with no duplicates.
Returns a new array.
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.
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.
Ruby arrays grow automatically while adding elements to them.
Ruby arrays are not as rigid as arrays in other languages.
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.
In the first form if no arguments are sent the new array will be empty.
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.
