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:

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:

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.
Improve this sample solution and post your code through Disqus
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
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