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# diffpatcher
[](http://travis-ci.org/Gozala/diffpatcher)
[](http://ci.testling.com/Gozala/diffpatcher)
Diffpatcher is a small library that lets you treat hashes as if they were
git repositories.
## diff
Diff function that takes two hashes and returns delta hash.
```js
var diff = require("diffpatcher/diff")
diff({ a: { b: 1 }, c: { d: 2 } }, // hash#1
{ a: { e: 3 }, c: { d: 4 } }) // hash#2
// => { // delta
// a: {
// b: null, // -
// e: 3 // +
// },
// c: {
// d: 4 // ±
// }
// }
```
As you can see from the example above `delta` makes no real distinction between
proprety upadate and property addition. Try to think of additions as an update
from `undefined` to whatever it's being updated to.
## patch
Patch fuction takes a `hash` and a `delta` and returns a new `hash` which is
just like orginial but with delta applied to it. Let's apply delta from the
previous example to the first hash from the same example
```js
var patch = require("diffpatcher/patch")
patch({ a: { b: 1 }, c: { d: 2 } }, // hash#1
{ // delta
a: {
b: null, // -
e: 3 // +
},
c: {
d: 4 // ±
}
})
// => { a: { e: 3 }, c: { d: 4 } } // hash#2
```
That's about it really, just diffing hashes and applying thes diffs on them.
### rebase
And as Linus mentioned everything in git can be expressed with `rebase`, that
also pretty much the case for `diffpatcher`. `rebase` takes `target` hash,
and rebases `parent` onto it with `diff` applied.
## Install
npm install diffpatcher
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