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JavaScript: Truncate a string to a certain number of words

JavaScript String: Exercise-24 with Solution

Write a JavaScript function to truncate a string to a certain number of words.

Test Data:
console.log(truncate('The quick brown fox jumps over the lazy dog', 4));
Output:
"The quick brown fox"

Pictorial Presentation:

JavaScript: Truncate a string to a certain number of words

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
<title>JavaScript function to truncate a string to a certain number of words</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function truncate(str, no_words) {
    return str.split(" ").splice(0,no_words).join(" ");
}

console.log(truncate('The quick brown fox jumps over the lazy dog', 4));

Sample Output:

The quick brown fox

Flowchart:

Flowchart: JavaScript- Truncate a string to a certain number of words

Live Demo:

See the Pen JavaScript Truncate a string to a certain number of words - string-ex-24 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript function to strip leading and trailing spaces from a string.
Next: Write a JavaScript function to alphabetize a given string.

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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: 

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv