deltaplane

DeltaPlane

Proxy to keep original data unchanged, but read and write changes using additional layer - 'delta' object.

npm install deltaplane

var o = { a:{b:{c:'original'}}, hello: 'world'};

var dp = DeltaPlane(o);
var p = dp.getPlane();
// if not changed then read from original
console.log(p.a.b.c); // 'original'
console.log(p.hello); // 'world'
// collect all changes in separate 'delta' object
p.a.b.c = 1;
// read changed values from delta
console.log(p.a.b.c); // '1'
// not changed value is still there
console.log(p.hello); // 'world'
// delta will have only changes
console.log(dp.getDelta()); // { a:{b:{c:1}}};
console.log(o);// original object is still safe.
// use existing deltas
var delta = {hello:"hi"};
dp = DeltaPlane(o, delta);
p = dp.getPlane();
console.log(p.hello);
console.log(p.a.b.c);
p.a.b.c = 2;
console.log(delta);

p = dp.getPlane(['a','b']);// specify base level other then root.
p.c = 3;
console.log(delta);

p = dp.getPlane(['x','y']);// specify base level for not existing original
p.z='ZZZZ';

console.log(delta);