Object.freeze: Immutable Objects

One of my favorite part of JavaScript has always been mutability of objects.  I loved that MooTools and likewise frameworks could modify native prototypes to enhance them with functionality we knew the language need; in fact, I credit MooTools with pushing the web forward.

There are cases, however, where you don’t want an object to be modifiable; you don’t want values for existing properties to be changed, added, or removed.  That’s where Object.freeze can help — with Object.freeze you can create immutable objects you can trust!

const obj = Object.freeze({
    x: 1,
    y: 2
});

// None of these do anything
obj.x = 8; // { x: 1, y: 2}
delete obj.x; // { x: 1, y: 2}
obj.z = 3;  // { x: 1, y: 2}

Object.freeze is a welcomed addition to JavaScript and a necessary one.

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