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JavaScript: Make a string uncamelize

JavaScript String: Exercise-12 with Solution

Write a JavaScript function to uncamelize a string.

Test Data:
console.log(uncamelize('helloWorld'));
console.log(uncamelize('helloWorld','-'));
console.log(uncamelize('helloWorld','_'));
"hello world"
"hello-world"
"hello_world"

Pictorial Presentation:

JavaScript: Make a string uncamelize

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>JavaScript uncamelize function</title>
</head>
<body>
</body>
</html>

JavaScript Code:

function uncamelize(str, separator) {
  // Assume default separator is a single space.
  if(typeof(separator) == "undefined") {
    separator = " ";
  }
  // Replace all capital letters by separator followed by lowercase one
  var str = str.replace(/[A-Z]/g, function (letter) 
  {
    return separator + letter.toLowerCase();
  });
  // Remove first separator
  return str.replace("/^" + separator + "/", '');
}
console.log(uncamelize('helloWorld'));
console.log(uncamelize('helloWorld','-'));
console.log(uncamelize('helloWorld','_'));

Sample Output:

hello world
hello-world
hello_world

Flowchart:

Flowchart: JavaScript- Make a string uncamelize

Live Demo:

See the Pen JavaScript Make a string uncamelize - string-ex-12 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript function to convert a string into camel case.
Next: Write a JavaScript function to concatenates a given string n times (default is 1).

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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