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JavaScript: Uncapitalize each word in the string

JavaScript String: Exercise-42 with Solution

Write a JavaScript function to uncapitalize each word in the string.

Test Data:
console.log(unCapitalizeWords('JS STRING EXERCISES'));
"js string exercises"

Pictorial Presentation:

JavaScript: Uncapitalize each word in the string

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript function to uncapitalize each word in the string</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function unCapitalizeWords(str)
{
 return str.replace(/\w\S*/g, function(txt){return txt.substr(0).toLowerCase();});
}
console.log(unCapitalizeWords('JS STRING EXERCISES'));

Sample Output:

js string exercises

Flowchart:

Flowchart: JavaScript: uncapitalize each word in the string

Live Demo:

See the Pen JavaScript Uncapitalize each word in the string-string-ex-42 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript function to capitalize each word in the string.
Next: Write a JavaScript function to test whether the character at the provided (character) index is upper case.

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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