JavaScript: Create a new object from the specified object, where all the keys are in lowercase
JavaScript fundamental (ES6 Syntax): Exercise-180 with Solution
Write a JavaScript program to create a new object from the specified object, where all the keys are in lowercase.
- Use Object.keys() and Array.prototype.reduce() to create a new object from the specified object.
- Convert each key in the original object to lowercase, using String.prototype.toLowerCase().
Sample Solution:
JavaScript Code:
//#Source https://bit.ly/2neWfJ2
const lowercaseKeys = obj =>
Object.keys(obj).reduce((acc, key) => {
acc[key.toLowerCase()] = obj[key];
return acc;
}, {});
const myObj = { Name: 'Adam', sUrnAME: 'Smith' };
const myObjLower = lowercaseKeys(myObj);
console.log(myObjLower);
Sample Output:
{"name":"Adam","surname":"Smith"}
Pictorial Presentation:
Flowchart:

Live Demo:
See the Pen javascript-basic-exercise-180-1 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Previous: Write a JavaScript program to compare two objects to determine if the first one contains equivalent property values to the second one, based on a provided function.
Next: Write a JavaScript program to get the last element from an given array.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
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
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework