jpatch v1.0.1

Motivation

A big string changes on the server, and we want to make the same change on the client, without retransmitting the whole string.

Example

const jpatch = require('jpatch')

const s1 = 'sandro is having a bad idea'
const s2 = 'sandro is having a good idea'

const patch = jpatch.make(s1, s2)
// => [ [ 0, 19 ], 'goo', [ 21, 27 ] ]

const made = jpatch.apply(patch, s1)
// made === s1

API

jpatch.make(old, new): compute an efficient patch from old to new

jpatch.apply(patch, old): re-compute new

Patch Format

Patch format is an array to be joined to make the result, after any subarrays are replaced by that slice() of the source text.

This patch:

[ [1,4], 'hello', [10,12] ]

Means the result will be computed as:

[source.slice(1,4), 'hello',  source.slice(10,12)].join('')

See Also

All the hard work is done by fast-diff

After I wrote this, I discovered textdiff-create which does approximately the same thing.