Ruby Array basic and advance methods

Hi, This is Shubham Mishra from India,  this is the part of Ruby on Rails exploration journey.  In this post we will discuss about the ruby array's some basic and advance methods and I am sure you will get excited to make your hands dirty with those code, so why to wait let's get started...

Ruby Array basic methods

1. push - adds an element to the end of the array


2. pop - removes the last element from the array and returns it


3. shift - removes the first element from the array and returns it


4. unshift - adds an element to the beginning of the array less


5. length - returns the number of elements in the array


6. join - converts the array into a string, with an optional separator


7. include? - returns true if the array contains a specified element


8. reverse - returns a new array with the elements in reverse order


9. sort - returns a new array with the elements sorted in ascending order


10. uniq - returns a new array with duplicate elements removed

Ruby Array Advance methods

1. map - returns a new array with the result of applying a block to each element in the array
2. select - returns a new array with only the elements that satisfy a condition specified in a block
3. reject - returns a new array with only the elements that do not satisfy a condition specified in a block
4. reduce - returns a single value that is the result of applying a block to each element in the array and accumulating the results
5. each_with_index - iterates over each element in the array and provides access to the index of each element
6. zip - returns a new array by combining elements from the original array with elements from one or more additional arrays
7. sort_by - returns a new array sorted based on a property or result of a block applied to each element
8. partition - returns a pair of arrays, one with elements that satisfy a condition specified in a block, and another with the remaining elements

Lets dive into some problem statement and try to solve it with ruby array methods,here is an example problem statement and solution that uses multiple Ruby array methods:

Problem statement: You have an array of integers representing daily temperatures (in degrees Celsius) for a week. Find the average temperature for each day of the week and return an array of average temperatures rounded to the nearest integer.

Solution:


Explanation of solution:

1. First, we use the map method to transform the temperatures array into a nested array temperatures_with_days, where the first element is the day index (starting at 0) and the second element is the temperature. We use the with_index method to access the index of each element while mapping over the array.
2. Next, we use the group_by method to group the nested arrays by the day index, resulting in an array temperatures_by_day of nested arrays where the first element is the day index and the second element is an array of temperatures for that day.
3. Then, we use the map method to iterate over each nested array in temperatures_by_day and calculate the average temperature for that day. We use the reduce method to sum up the temperatures in the nested array and divide by the length of the nested array to get the average temperature. Finally, we use the round method to round the average temperature to the nearest integer.
4. We assign the resulting array of average temperatures to the average_temperatures variable and output it using puts.

This solution uses multiple array methods including map, with_index, group_by, and reduce to transform the input data and perform calculations on it.

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