How to Truncate A String In Elixir in 2024?

To truncate a string in Elixir, you can use the String.truncate/2 function. This function takes two arguments - the string you want to truncate and the maximum length you want to truncate it to.

Here is an example of how you can use String.truncate/2:

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str = "Lorem ipsum dolor sit amet"
truncated_str = String.truncate(str, 10)
IO.puts(truncated_str)

This will output:

1	Lorem ipsu

You can also specify a truncation_indicator as a third argument to String.truncate/2 to indicate that the string has been truncated.

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str = "Lorem ipsum dolor sit amet"
truncated_str = String.truncate(str, 10, "...")
IO.puts(truncated_str)

This will output:

1	Lorem ipsu...

Using String.truncate/2 is an easy way to truncate strings in Elixir while still being able to specify the maximum length and truncation indicator.

How to truncate a string in Elixir and remove any HTML tags or markup?

You can achieve this by using the Floki library in Elixir. First, you need to add Floki to your mix.exs file:

defp deps do
  [
    {:floki, "~> 0.32"}
  ]
end

Then, you can truncate a string and remove HTML tags using the following code:

html_string = "<p>This is an example <strong>HTML</strong> string.</p>"
truncated_string = Floki.text(html_string)
|> String.trim()
|> String.slice(0, 20)

IO.puts truncated_string

This code snippet first parses the HTML string using Floki.text, then trims the string and finally slices it to the desired length. The resulting truncated_string will be the first 20 characters of the original HTML string without any HTML tags or markup.

What is the recommended maximum length for truncating a string in Elixir?

It is recommended to truncate a string in Elixir to a maximum length of 255 characters. This is because longer strings can impact performance and readability of the code. It is important to consider the specific use case and requirements when determining the appropriate length for truncating a string.

What is the best approach to truncate a string in Elixir for performance?

One of the best approaches to truncate a string in Elixir for performance is to use pattern matching and slicing. This allows you to quickly extract a portion of the string without having to iterate over each character.

Here's an example of how you can truncate a string to a specific length using pattern matching and slicing:

def truncate_string(str, len) when byte_size(str) > len do
  <<truncated::binary-size(len)>> = str
  truncated
end

str = "This is a long string that needs to be truncated for performance"
truncated_str = truncate_string(str, 10)
IO.puts(truncated_str) # Output: "This is a"

By using pattern matching and slicing, we ensure that only the portion of the string up to the specified length is extracted, making the operation more efficient in terms of performance.

How to truncate a string in Elixir and normalize or standardize the truncated part?

To truncate a string in Elixir, you can use the String.slice/2 function. Here is an example of how you can truncate a string to a specific length and normalize or standardize the truncated part:

defmodule TruncateString do
  def truncate_and_normalize(string, length) do
    truncated = String.slice(string, 0, length)
    normalized_truncated = String.normalize(truncated)
    {truncated, normalized_truncated}
  end
end

# Example usage
{truncated, normalized_truncated} = TruncateString.truncate_and_normalize("This is a long string that needs to be truncated", 10)
IO.puts("Truncated: #{truncated}")
IO.puts("Normalized truncated: #{normalized_truncated}")

In this code snippet, the truncate_and_normalize function takes a string and a length as arguments. It uses String.slice/2 to truncate the string to the specified length and then uses String.normalize/1 to normalize or standardize the truncated part. The function returns a tuple containing the truncated string and the normalized truncated string.

You can adjust the length parameter to truncate the string to your desired length, and customize the normalization function as needed.

How to truncate a string in Elixir and add an ellipsis at the end?

You can truncate a string in Elixir and add an ellipsis at the end using the String.slice/2 function and string concatenation. Here's an example:

def truncate_with_ellipsis(str, max_length) do
  if String.length(str) <= max_length do
    str
  else
    String.slice(str, 0, max_length) <> "..."
  end
end

# Example usage
IO.puts(truncate_with_ellipsis("Lorem ipsum dolor sit amet", 10)) # Output: "Lorem ips..."

In the example above, the truncate_with_ellipsis function takes a string str and a maximum length max_length. If the length of the string is less than or equal to the maximum length, it returns the original string. Otherwise, it truncates the string using String.slice to the specified maximum length and appends an ellipsis using string concatenation (<>).

How to truncate a string in Elixir and extract a specific part of the truncated string?

One way to truncate a string in Elixir is to use the String.slice/2 function, which can extract a specific portion of the string after truncating it. Here is an example code snippet to demonstrate this:

text = "This is a long example text that we want to truncate."

truncated_text = String.slice(text, 0..20)
extracted_text = String.slice(text, 10..20)

IO.puts truncated_text
IO.puts extracted_text

In this example, we first define a text variable with a long string. We then use the String.slice/2 function to truncate the text to the first 20 characters and store it in the truncated_text variable. We also use the String.slice/2 function to extract a specific portion of the truncated text (from characters 10 to 20) and store it in the extracted_text variable.

When you run this code, you should see the truncated text and the extracted portion printed to the console.

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How to Truncate A String In Elixir?