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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

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04