I was trying to fix duplicate items in an array on javascript by the means of object keys. The loop added 'virtual reality' and 'Virtual Reality' in the same object as different keys. Is there a way to make Javascript object not case sensitive ?

I was trying to fix duplicate items in an array on javascript by the means of object keys. The loop added 'virtual reality' and 'Virtual Reality' in the same object as different keys. Is there a way to make Javascript object not case sensitive ?

• javascript
• dictionary

• 3 JavaScript doesn't have dictionaries, it has objects. Aside from that, strings (which is really what you are talking about) are always case-sensitive. – Scott Marcus Commented Feb 22, 2017 at 19:28
• 1 yes are case sensitive, but not dictionaries, only objects, but in newer revisions exists Map – Álvaro Touzón Commented Feb 22, 2017 at 19:28
• You can always reduce the input to lower case and just pare everything as lower case. – Jon Glazer Commented Feb 22, 2017 at 19:29
• stackoverflow./questions/12484386/… – Hobroker Commented Feb 22, 2017 at 19:29
• Related: Access JavaScript property case-insensitively?, Is the hasOwnProperty method in JavaScript case sensitive?, Can an Object have case-insensitive member access? – Bergi Commented Dec 14, 2020 at 21:27

3 Answers 3

While object properties are strings and they are case sensitive, you could use an own standard and use only lower case letters for the access.

You could apply a String#toLowerCase to the key and use a function as wrapper for the access.

Example with a wrapper object.

function insert(key, value) {
    if (!wrapper[key.toLowerCase()]) {
        wrapper[key.toLowerCase()] = key;
    }
    data[wrapper[key.toLowerCase()]] = value;
}

var data = {},
    wrapper = {};

insert('Foo', 'bar');
console.log(data);
insert('FOO', '42');
console.log(data);

Are javascript object keys case sensitive?

Yes, open your favorite browser's console to find your answer. I used Chrome:

var obj = {'one': 1}

obj.one

1

obj.ONE

undefined

obj['one']

1

obj['ONE']

undefined

JavaScript like most languages is indeed case sensitive.