Ruby Hash and its 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's Hash and its methods available to simplify our development and make the code more smarter 😅

Ok then without wasting a time we start looking into Ruby's Hash. If you are new to the development then you can read below or if you are aware of what is hash then you can skip to next paragraph.

Hash: Similar to array the Hash is a collection of objects but in the diffrent fashion. The hash store the items in the form of a key and its value. In short see below image, how lock can be access by the key assigned to it, similar to this only hash works.

Enough theory let jump into it with some example, One important think to remember is Hash will always take unique key, It means one key cannot be considered again in the hash.

Now i think you understood how hash works, now lets jump into some of the hash methods and how can we use it in diffrent ways. But before going ahead you may have seen some hash with keys without string, that is even possible and that is known as Symbol. Have a look into it, (In most of the time I would suggest to go with symbol since in ruby, symbol are more memory efficient than string but that is a diffrent topic, lets stick to the hash only)


Ok lets move with the code only, I think reading unnecessary things is just waist of time, we can learn a more from the code. The first we will have a look on merge



Now a day we are developing filter and sorting the list on product or other pages, so its necessary to look how can we sort a hash in ruby

In above code you may have notice that a hash's value could be a hash also. Ok now we will also look into delete methods,


Now I think enough reading, I would suggest you to open your rails terminal and play with the code! 💻

Get to know answers for common search on Google : A blog for posts which can help you for daily life problems, such as where to get free images, Topic suggestion for the blog.

Computer Science algorithms and other knowledge share : A blog for posts such as best search algorithm, Top interview questions for diffrent technologies, knowledge share for some frameworks or programming languages for the interview or in general terms.

My ideas to solve real world problems : A blog where me shared and presented my ideas to solve a real world problems, this will be interesting for me.

Future of computer science technology discussed : A blog where me discussed about the future of computer science and new technologies which will change our way for looking to solve problems.

Ruby on Rails Web development Blog : As the name suggest, it is the blog for sharing few knowledge about RoR web development framework.

Comments

Post a Comment

Popular posts from this blog

Rails Postgresql Query timeout set and skip during migration

Hi, I am  Shubham Mishra  from India,  this is the part of  Ruby on Rails  exploration journey.  In this post we will discuss about the rails DB (Postgresql) query time out setting and how can we avoid this timeout setting during migration and I am sure you will get excited to make your hands dirty with those code, so why to wait let's get started... Question: Rails and postgresql I want to set query timeout to 10 sec but skip to check this timeout setting during rails migration how can i achieve? Answer: To set a query timeout of 10 seconds for PostgreSQL in a Rails application, you can use the statement_timeout configuration option in your database.yml file. Here is an example configuration that sets the query timeout to 10 seconds: This will set the query timeout to 10 seconds for all queries executed by the PostgreSQL adapter in the production environment. To skip checking the query timeout setting during Rails migrations, you can use a custom connection adapter tha
Read more

Rails Sync Postgresql and Elasticsearch Database of a Model

Hi, This is  Shubham Mishra  from India,  this is the part of  Ruby on Rails  exploration journey.  In this post we will discuss about how can we keep Postgresql (a SQLDB) and Elasticsearch (a nonSQL DB) with the help of a background job processor and I am sure you will get excited to make your hands dirty with those code, so why to wait let's get started... Most of the time due to increase in DB record size we try to split our DB into two DB based on the requirement like one is Transaction oriented (SQL DB) and another Search oriented (Non SQL DB) with limited data. In my case we have Postgresql for storing all the records and used for entire business operation and for Search support we have elasticsearch with minimum indexes (tables) and their entire documents. For better understanding lets consider in PG DB we have Employee table with id, name, dob, address etc and some more other tables, whereas in Elasticsearch we have only Employee index (table) with all its documents dupli
Read more

Ruby on Rails configure CORS setting with rack cors gem

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 CORS concepts and I am sure you will get excited to make your hands dirty with those code, so why to wait let's get started... What is CORS? Cross-Origin Resource Sharing, sometimes known as CORS, is a security feature built into web browsers that enables web servers to manage which domains can access their resources. It is used to stop rogue websites or programmes from gaining unauthorised access to a web server's resources. In plainer terms, a web browser will submit a CORS request to the server whenever a web application makes a request to a domain other than the one it is currently executing on in order to determine whether it is authorised to access the resources of that domain. The browser can retrieve the resources and show them to the user if the server agrees to the request. Why CORS is important? If CORS is not used, malici
Read more