CODEWITHSUNDEEP
javascript
S Meaden
S Meaden

Reputation: 8270

In Javascript can an Object have case insensitive member access?

I would like a Javascript class that acts pretty much like an ordinary object in its expando capability but with case insensitive access. So

var foo = new MyObject();
foo.Bar = "Baz";
alert (foo.bAR) ;   // I want this not to error but to be forgiving and print Baz

Javascript is not my main development language so I am not familiar with guts of the language. Is there a fancy way of using prototypes perhaps?

Sorry, also stuck on an old version of Javascript I should mention (dunno for sure possible version 3)

Upvotes: 0

Views: 205

Answers (2)

Get Off My Lawn
Get Off My Lawn

Reputation: 36341

You can do this using a Proxy.

In the proxy, we convert the key that we are searching for to lowercase and the objects keys to lowercase and look for the property in the target.

class MyObject {
  constructor() {
    // Some property that we want to use
    this.bar = 'abc'

    // Return a new proxy
    return new Proxy(this, {
      get: (target, prop) => target[prop.toLowerCase()],
      set: (target, prop, value) => (target[prop.toLowerCase()] = value)
    })
  }
}

var foo = new MyObject()
foo.Bar = "Baz"
console.log(foo.bAR)

Upvotes: 4

Nina Scholz
Nina Scholz

Reputation: 386736

You could take a proxy and address the property directly with the lower case value of the key.

var foo = {},
    proxy = new Proxy(foo, {
        get: function(obj, prop) {
            return obj[prop.toLowerCase()];
        },
        set: function(obj, prop, value) {
            obj[prop.toLowerCase()] = value;
        }
    });

proxy.Bar = "Baz";

console.log(proxy.bAR);

Upvotes: 4

Related Questions