JavaScript: Convert a string from camelcase

JavaScript fundamental (ES6 Syntax): Exercise-229 with Solution

Write a JavaScript program to convert a string from camelcase.

• Use String.prototype.replace() to break the string into words and add a separator between them.
• Omit the second argument to use a default separator of _.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const fromCamelCase = (str, separator = '_') =>
  str
    .replace(/([a-z\d])([A-Z])/g, '$1' + separator + '$2')
    .replace(/([A-Z]+)([A-Z][a-z\d]+)/g, '$1' + separator + '$2')
    .toLowerCase();

console.log(fromCamelCase('someDatabaseFieldName', ' '));
console.log(fromCamelCase('someLabelThatNeedsToBeCamelized', '-'));
console.log(fromCamelCase('someJavascriptProperty', '_'));

Sample Output:

some database field name
some-label-that-needs-to-be-camelized
some_javascript_property

Pictorial Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-229-1 by w3resource (@w3resource) on CodePen.

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