js-installproperty


js-installproperty
==================

defineProperty, undoably.

SYNOPSIS
--------

One property by one…

```javascript
var o = Object.create(null), prev, descs;
Object.installProperty(o, "k", {value:1}); // true
Object.defineProperty(o, "ng", {value:'IGNOREME'}); // define an immutable property
Object.installProperty(o, "ng", {value:1}); // false because the target is immutable
Object.installProperty(o, "k", {value:2}); // true
console.log(o.k); // 2
prev = Object.revertProperty(o, "k")
console.log(prev); // {value:2, configurable:true, writable:true, enumerable:false}
console.log(o.k); // 1
prev = Object.revertProperty(o, "k") // undefined // undo buffer is empty
``

…or all at once!

``javascript
o = [0, 1]; // any object will do! (unless it is primitive, of course)
descs = {0:{value:1},1:{value:2}};
Object.installProperties(o, descs);
console.log(o[0], o[1]); // 1, 2
Object.revertProperties(o, descs);
console.log(o[0], o[1]); // 0, 1
```