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Library to diff JSON objects into atomic put and delete operations, and apply change sets to objects. Useful with Levelup/LevelDB object synchronization.
Generate diff changesets for javascript objects, decomposing diffs into a series of puts and delete operations. The format is similar to the levelup batch operation list for bulk operations.
Handles circular references of Objects and Arrays.
Take a diff of two objects and produce a list of transformation operations:
var diff = require('changeset');
var a = {
name: 'Eugene',
number: 42,
tags: ['tag1', 'tag2', 'tag3'],
scores: {
tetris: 1000,
carmageddon: 3
}
};
var b = {
name: 'Susan',
number: 43,
tags: ['tag1', 'tag4'],
scores: {
carmageddon: 3,
zelda: 3000
},
age: 37
};
var changes = diff(a, b);
expect(changes).to.deep.equal([
{ type: 'put', key: ['name'], value: 'Susan' },
{ type: 'put', key: ['number'], value: 43 },
{ type: 'put', key: ['tags', '1'], value: 'tag4' },
{ type: 'del', key: ['tags', '2'] },
{ type: 'del', key: ['scores', 'tetris'] },
{ type: 'put', key: ['scores', 'zelda'], value: 3000 },
{ type: 'put', key: ['age'], value: 37 }
]);
Apply an operational changeset and apply it to an object to get a transformed object:
var diff = require('changeset');
var changes = [
{ type: 'put', key: ['name'], value: 'Susan' },
{ type: 'put', key: ['number'], value: 43 },
{ type: 'put', key: ['tags', '1'], value: 'tag4' },
{ type: 'del', key: ['tags', '2'] },
{ type: 'del', key: ['scores', 'tetris'] },
{ type: 'put', key: ['scores', 'zelda'], value: 3000 },
{ type: 'put', key: ['age'], value: 37 }
];
var a = {
name: 'Eugene',
number: 42,
tags: ['tag1', 'tag2', 'tag3'],
scores: {
tetris: 1000,
carmageddon: 3
}
};
// apply the changes to a
var b_ = diff.apply(changes, a);
var b = {
name: 'Susan',
number: 43,
tags: ['tag1', 'tag4'],
scores: {
carmageddon: 3,
zelda: 3000
},
age: 37
};
// the transformed object should now equal b
expect(b_).to.deep.equals(b);
By default apply
will return a new modified object after applying the
changeset. If you want to modify the destination, pass true as the third
parameter:
// apply the changes to a and modify a
var b_ = diff.apply(changes, a, true);
// a is now modified, and b_ is the same as a
expect(b_).to.equal(a);
FAQs
Library to diff JSON objects into atomic put and delete operations, and apply change sets to objects. Useful with Levelup/LevelDB object synchronization.
The npm package changeset receives a total of 4,210 weekly downloads. As such, changeset popularity was classified as popular.
We found that changeset demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.
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