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