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JavaScript: Create a new string adding "Py" in front of a given string

JavaScript Basic: Exercise-21 with Solution

Write a JavaScript program to create a new string adding "Py" in front of a given string. If the given string begins with "Py" then return the original string.

Pictorial Presentation:

JavaScript: Create a new string adding

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 adding “Py” in front of a given string.  If the given string begins with “Py” then return the original string.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function string_check(str1) {
  if (str1 === null || str1 === undefined || str1.substring(0, 2) === 'Py') 
  {
    return str1;
  }
  return "Py"+str1;
}

console.log(string_check("Python"));
console.log(string_check("thon"));

Sample Output:

Python
Python

Flowchart:

Flowchart: JavaScript - Create a new string adding

ES6 Version:

function string_check(str1) {
  if (str1 === null || str1 === undefined || str1.substring(0, 2) === 'Py') 
  {
    return str1;
  }
  return `Py${str1}`;
}

console.log(string_check("Python"));
console.log(string_check("thon"));

Live Demo:

See the Pen JavaScript: Create new string: basic-ex-21 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to check from two given integers, if one is positive and one is negative.
Next: Write a JavaScript program to remove a character at the specified position of a given string and return the new string.

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JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925 

Output:

385
3025
2925