w3resource

JavaScript: Extract a specific number of characters from a string

JavaScript String: Exercise-4 with Solution

Write a JavaScript function to extract a specified number of characters from a string.

Pictorial Presentation:

JavaScript: Extract a specific number of characters from a string

Test Data :
console.log(truncate_string("Robin Singh",4));
"Robi"

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Extract a specific number of characters from a string</title>
</head>
<body>
</body>
</html>

JavaScript Code:

truncate_string = function (str1, length) {
  
    if ((str1.constructor === String) && (length>0)) {
        return str1.slice(0, length);
    }
};
console.log(truncate_string("Robin Singh",4));

Sample Output:

Robi

Flowchart:

Flowchart: JavaScript- Extract a specific number of characters from a string

Live Demo:

See the Pen JavaScript Extract a specific number of characters from a string - string-ex-4 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to split a string and convert it into an array of words.
Next: Write a JavaScript function to convert a string in abbreviated form.

What is the difficulty level of this exercise?



JavaScript: Tips of the Day

Converts a given string into an array of words

Example:

const words = (str, pattern = /[^a-zA-Z-]+/) => str.split(pattern).filter(Boolean);
console.log(words('I love javaScript!!')); // ["I", "love", "javaScript"]
console.log(words('python, javaScript & coffee')); // ["python", "javaScript", "coffee"] 

Output:

["I", "love", "javaScript"]
["python", "javaScript", "coffee"]