Do not update when data is the same

It would be good if update function could return previous data if changed variable is the same

i mean let a = {b: {c: {d : 5}}}; let z = update(a, {b: {c: {d : {$set: 5}}}); here ‘z’ changes even though value is the same. Right now i have a performance issue with react application, cause after update i receive new object most of the times with the same value as previous.

I believe Implementing this feature would speed up a react application

[kolodny]

Hmm, I don’t want to default to a deepEqual. What about exposing an escape hatch for this? See 02243b7 for details.

[kolodny]

Hi danziamo. This currently works out of the box unless I’m misunderstanding what you’re referring to:

https://runkit.com/embed/yofw29ccbyeq

var update = require("immutability-helper")

let a = {b: {c: {d : 5}}};
let z = update(a, {b: {c: {d : {$set: 5}}}});
console.log(a === z) // true