JavaScript: Remove non-printable ASCII chars

JavaScript String: Exercise-32 with Solution

Remove Non-Printable ASCII

Write a JavaScript function to remove  non-printable ASCII characters.

Test Data:
console.log(remove_non_ascii('äÄçÇéÉêPHP-MySQLöÖÐþúÚ'));
"PHP-MySQL"

Sample Solution:

JavaScript Code:

// Define a function named remove_non_ascii that takes a string parameter str
function remove_non_ascii(str) {
  // Check if the input string is null or empty. If true, return false.
  if ((str===null) || (str===''))
       return false;
  // Convert the input string to a string if it's not already
  else
    str = str.toString();
  
  // Use the replace method with a regular expression to remove non-ASCII characters
  // The regular expression /[^\x20-\x7E]/g matches any character that is not in the range of ASCII printable characters (hexadecimal values from 0x20 to 0x7E)
  return str.replace(/[^\x20-\x7E]/g, '');
}

// Call the remove_non_ascii function with a test string and log the result to the console
console.log(remove_non_ascii('äÄçÇéÉêPHP-MySQLöÖÐþúÚ'));

Output:

PHP-MySQL

Explanation:

The above JavaScript code defines a function called "remove_non_ascii()" that removes non-ASCII characters from a given string. Here's a brief explanation of each part of the code:

• 'function remove_non_ascii(str) {': This line defines the function 'remove_non_ascii' that takes a string parameter 'str'.
• 'if ((str===null) || (str==='')) return false;': This line checks if the input string is null or empty. If it is, the function returns 'false'.
• 'else str = str.toString();': If the input string is not null or empty, it converts the input string to a string type if it's not already.
• 'return str.replace(/[^\x20-\x7E]/g, '');': This line uses the 'replace' method with a regular expression to remove non-ASCII characters from the string. The regular expression '/[^\x20-\x7E]/g' matches any character that is not in the range of ASCII printable characters (hexadecimal values from 0x20 to 0x7E).
• 'console.log(remove_non_ascii('äÄçÇéÉêPHP-MySQLöÖÐþúÚ'));': This line calls the "remove_non_ascii()" function with a test string ''äÄçÇéÉêPHP-MySQLöÖÐþúÚ'' and logs the result to the console. The function removes non-ASCII characters from the input string and returns the modified string.

Flowchart:

Live Demo:

See the Pen JavaScript Remove non-printable ASCII chars - string-ex-32 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that removes characters with ASCII codes below 32 from a string.
• Write a JavaScript function that uses regular expressions to filter out non-printable ASCII characters.
• Write a JavaScript function that validates the input and returns a clean string with only printable characters.
• Write a JavaScript function that processes a string and strips out control characters while preserving visible ones.

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