How do you sort in Ruby?
You can use the sort method on an array, hash, or another Enumerable object & you’ll get the default sorting behavior (sort based on <=> operator) You can use sort with a block, and two block arguments, to define how one object is different than another (block should return 1, 0, or -1)
What does the sort method do in Ruby?
sort works: . sort is a Ruby enumerator that compares two elements in an array at a time. It can be called with or without a block, but if called with a block, the block requires two arguments, which represent the two things being compared.
Is Ruby sort stable?
The Array#sort method in Ruby uses the venerable Quicksort algorithm. Other sorting algorithms, such as merge sort and bubble sort, are stable. … However they are not as efficient.
Are there lists in Ruby?
A Ruby array offers a full list interface: push/<< for adding element at the end. each provides an iterator for list traversal. sort lets you sort the items with an optional block for a custom comparator.
What does <=> mean in Ruby?
It’s a general comparison operator. It returns either a -1, 0, or +1 depending on whether its receiver is less than, equal to, or greater than its argument.
How do you sort hash?
Hashes can be sorted in many ways as follows:
- Sorting the Hash according to the ASCII values of its keys: Generally, sorting is based on ASCII table. …
- Sorting the Hash according to the alphabetical order of its keys: Here, the keys are sorted alphabetically.
Are Ruby arrays ordered?
Arrays are ordered, integer-indexed collections of any object. Array indexing starts at 0, as in C or Java.
What is a Hash Ruby?
In Ruby, Hash is a collection of unique keys and their values. Hash is like an Array, except the indexing is done with the help of arbitrary keys of any object type. … When a user tries to access the keys which do not exist in the hash, then the nil value is returned.
How do you reverse an array in Ruby?
Array#reverse() : reverse() is a Array class method which returns a new array containing self’s elements in reverse order.
- Syntax: Array.reverse()
- Parameter: Array.
- Return: a new array containing self’s elements in reverse order.
Is insertion sort incremental?
Insertion sort is an example of an incremental algorithm.
What is the quick sort algorithm?
Quicksort is a divide-and-conquer algorithm. It works by selecting a ‘pivot’ element from the array and partitioning the other elements into two sub-arrays, according to whether they are less than or greater than the pivot.
What is Attr_accessor in Ruby?
attr_accessor is a shortcut method when you need both attr_reader and attr_writer . … Since both reading and writing data are common, the idiomatic method attr_accessor is quite useful.
Is array in Ruby?
In Ruby, numbers, strings, etc all are primitive types but arrays are of objects type i.e arrays are the collection of ordered, integer-indexed objects which can be store number, integer, string, hash, symbol, objects or even any other array.
Is Ruby queue thread safe?
Ruby has a proper thread-safe, blocking, Queue class. You can use this queue for coordinating work in a multi-threaded program. … If the queue is empty, calling pop will put your current thread to sleep & wait until something is added to the queue. That’s what it means to “block”.