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:

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:

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
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