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What is the Read function in Ruby?

Faraz Karim

Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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The read method in Ruby allows you to read data stored in a file.

Syntax

Following is how you use the read method:

In the syntax below, my_file represents the file pointer of the opened file:

Prerequisite for usage

To use this method, you must first open up a file using another ruby method called open and then call the read method on the file pointer of the opened file.

Parameters

The read requires no parameters to work, only an accompanying file pointer to call on.

Return value

The read method returns all the data stored in the file.

Examples

The following is an example where we read and print the stored data in a .txt file in the same directory as our main file:

main.rb
to_read.txt
# opening the file
f = File.open("to_read.txt")
# reading data
data_read = f.read
# closing the file
f.close
# printing the read data
puts data_read

In Ruby, puts is the function we use to print data out to the console similar to console.log in Nodejs

Instead of opening and closing a file every time to read, you can use the File.read method. The File.read method takes in the name of the file you want to open and reads and returns the data stored in it.

Following is a code example showing its usage:

main.rb
to_read.txt
# opening the file
data_read = File.read("to_read.txt")
# printing the read data to the console
puts data_read

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Faraz Karim
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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