JavaScript: Make a string uncamelize

Last update on May 30 2022 10:02:29 (UTC/GMT +8 hours)

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:

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:

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).

JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04