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JavaScript: Create new string with first 3 characters are in lower case

JavaScript Basic: Exercise-37 with Solution

Write a JavaScript program to create a new string with first 3 characters are in lower case from a given string. If the string length is less than 3 convert all the characters in upper case.

Pictorial Presentation:

JavaScript: Create new string with first 3 characters are in lower case

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to create new string with first 3 characters are in lower case from a given string. If the string length is less than 3 convert all the characters in upper case.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function upper_lower(str) {
  if (str.length < 3) {
    return str.toUpperCase();
  }
  front_part = (str.substring(0, 3)).toLowerCase();
  back_part = str.substring(3, str.length);  
  return front_part + back_part;
}
console.log(upper_lower("Python"));
console.log(upper_lower("Py"));
console.log(upper_lower("JAVAScript"));

Sample Output:

python
PY
javAScript

Flowchart:

Flowchart: JavaScript - Create new string with first 3 characters are in lower case

ES6 Version:

function upper_lower(str) {
  if (str.length <= 3) {
    return str.toUpperCase();
  }
  front_part = (str.substring(0, 3)).toLowerCase();
  back_part = str.substring(3, str.length);  
  return front_part + back_part;
}
console.log(upper_lower("Python"));
console.log(upper_lower("Py"));
console.log(upper_lower("JAVAScript"));

Live Demo:

See the Pen JavaScript: check if the last digit of the three given positive integers is same - basic-ex-36 by w3resource (@w3resource) on CodePen.


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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