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JavaScript: Create a new string of 4 copies of the last 3 characters of a given original string

JavaScript Basic: Exercise-58 with Solution

Write a JavaScript program to create a new string of 4 copies of the last 3 characters of a given original string. The length of the given string must be 3 and above.

Pictorial Presentation:

JavaScript: Create a new string of 4 copies of the last 3 characters of a given original string

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to create a new string of 4 copies of the last 3 characters of a given original string. The length of the given string must be 3 and above.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function newstring(str)
{
  if (str.length >= 3) {
    result_str = str.substring(str.length - 3);
    return result_str + result_str + result_str + result_str;
  }
  else
    return false;
}
console.log(newstring("Python 3.0"));
console.log(newstring("JS"));
console.log(newstring("JavaScript"));

Sample Output:

3.03.03.03.0
false
iptiptiptipt

Flowchart:

Flowchart: JavaScript - Create a new string of 4 copies of the last 3 characters of a given original string

ES6 Version:

function newstring(str)
{
  if (str.length >= 3) {
    result_str = str.substring(str.length - 3);
    return result_str + result_str + result_str + result_str;
  }
  else
    return false;
}
console.log(newstring("Python 3.0"));
console.log(newstring("JS"));
console.log(newstring("JavaScript"));

Live Demo:

See the Pen JavaScript - Create a new string of 4 copies of the last 3 characters of a string - basic-ex-57 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to create a new string of specified copies (positive number) of a given string.
Next: Write a JavaScript program to extract the first half of a string of even length.

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JavaScript: Tips of the Day

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters)

Example:

const isAnagram = (str1, str2) => {
  const normalize = str =>
    str
      .toLowerCase()
      .replace(/[^a-z0-9]/gi, '')
      .split('')
      .sort()
      .join('');
  return normalize(str1) === normalize(str2);
};
console.log(isAnagram('iceman', 'cinema')); // true

Output:

true