How to get all the possible K length Substrings in a String in Ruby - Step by Step Examples

How to get all the possible K length Substrings in a String in Ruby ?

Answer

To get all possible K length substrings in a string in Ruby, you can use a loop to iterate through the string and extract substrings of the desired length.

✐ Examples

1 Getting All 3-length Substrings from "Hello World"

In this example,

Create a string named str with a value of "Hello World" using the assignment operator `=`.
Define a variable k and assign it the value `3`, representing the length of substrings we want to extract.
Initialize an empty array named substrings to store the extracted substrings.
Use a `for` loop with the index variable i ranging from `0` to `str.length - k`. This loop iterates through the string, stopping when there are fewer than k characters left to extract a substring.
Within the loop, use the slice method `str[i, k]` to extract a substring starting at index i and of length k. Append this substring to the substrings array using the `<<` operator.
After the loop completes, print the substrings array using the `puts` method to display all the extracted substrings.

Ruby Program

str = "Hello World"
k = 3
substrings = []

for i in 0..(str.length - k)
  substrings << str[i, k]
end

puts "All #{k}-length substrings: #{substrings}"

Output

All 3-length substrings: ["Hel", "ell", "llo", "lo ", "o W", " Wo", "Wor", "orl", "rld"]

2 Getting All 2-length Substrings from "apple"

In this example,

Create a string named str with a value of "apple" using the assignment operator `=`.
Define a variable k and assign it the value `2`, representing the length of substrings we want to extract.
Initialize an empty array named substrings to store the extracted substrings.
Use a `for` loop with the index variable i ranging from `0` to `str.length - k`. This loop iterates through the string, stopping when there are fewer than k characters left to extract a substring.
Within the loop, use the slice method `str[i, k]` to extract a substring starting at index i and of length k. Append this substring to the substrings array using the `<<` operator.
After the loop completes, print the substrings array using the `puts` method to display all the extracted substrings.

Ruby Program

str = "apple"
k = 2
substrings = []

for i in 0..(str.length - k)
  substrings << str[i, k]
end

puts "All #{k}-length substrings: #{substrings}"

Output

All 2-length substrings: ["ap", "pp", "pl", "le"]

Summary

In this tutorial, we learned How to get all the possible K length Substrings in a String in Ruby language with well detailed examples.

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