object-diff | minimal patch from an original object
kandi X-RAY | object-diff Summary
kandi X-RAY | object-diff Summary
Get the minimal patch to extend objectA with to transform it into objectB.
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QUESTION
I wish to create a sparse matrix from a list. I can create a typical matrix using the approach presented here:
Class of output object differs as input data differs
Below is a small reproducible example of the typical matrix.
ANSWER
Answered 2020-Oct-13 at 21:26Maybe you can try the following base R option
QUESTION
This has come about because during prototyping, I'm finding that incoming new prop(s) might be an array of complex objects, so prevProps.myProp===this.props.myProp is always false. JSON.stringifying them both before comparison works, but feels unreliable.
I'm trying to write a reusable function for Class Components that compares prev/new props in react's componentDidUpdate. For example:
ANSWER
Answered 2020-Jun-18 at 13:44that would mean any time the incoming props change, those get immediately reflected in state
Yes, that's wrong. When I first started out I was doing the same thing.
stateis something "owned" by that component (noteworthy: not all components need state at all!).propsare something that are "owned" by a higher component.
Best example:
ComponentA passed an id to ComponentB as a prop. ComponentB uses that id to make an API request (for example).
The status/results of that API request form part of ComponentB's state (it's "owned" by your component). The id passed in as a prop is NOT part of ComponentB's state (it's owned by ComponentA, or maybe somewhere higher in the tree that passed it as a prop to ComponentA).
When the id prop changes, ComponentB will need to make another API request.
EDIT:
The complexity of lifecycle methods is why React has highly encouraged functional components.
You should think of components as functions. It's a lot easier to write the logic if you just think of it as input -> output.
componentDidUpdate has been moved to useEffect with a dependency list so you can say - run this function, but only when this prop changes - which is a nice way to break down massive componentDidUpdate methods into tiny readbale/testable chunks.
I've heard a lot of people say hooks ruined react, but I highly disagree with them. React saw the problems people were running into in the community by misusing class/instance based components and instead of lecturing about how to use them correctly, they nudged people to writing better components by introucing a simpler API - functions, while they still can and will be abused - are generally simpler to deal with than classes and align nicely with composition over inheritance and declarative over imperative.
QUESTION
I'm using dep-object-diff, which returns differences between two objects.
The problem is that if I have something like,
...ANSWER
Answered 2020-Apr-16 at 07:34You could get the entries, convert the array like object to array with Object.assign and an array as target and convert back to an object.
QUESTION
Following the steps on https://jestjs.io/docs/en/troubleshooting.
In package.json created the task:
...ANSWER
Answered 2020-Jan-30 at 11:34Turns out you need to use react-scripts instead of executing jest directly when using CRA: https://create-react-app.dev/docs/debugging-tests/
QUESTION
I have an object called item:
And I also have a PUT request that sould be able to change some of the values inside of item. Some values are inside of objects and others aren't. An example is that I need to be able to change the values inside of the settings obj. Currently my PUT request looks like this:
ANSWER
Answered 2019-Feb-04 at 17:38router.route('/cookies/:id')
.put(function(req, res) {
Items.findById(req.params.id, function(err, item) {
if (err)
res.send(err);
// if you want update all settings object
item.settings = req.body;
// if something on settings field, item.settings.field1 = req.body.field1
item.save(function(err) {
if (err)
res.send(err);
res.json({ message: 'Your item updated!' });
});
});
});
QUESTION
I have a set of objects that contain fields & properties that need to be inspectable in the output of serialization but not read back in when deserialized.
This is purely for debugging/confirmation purposes. We are creating hundreds of files and I want to spot check that serialization is occurring correctly by adding supplementary information. I do not want this supplementary information to be read in during deserialization - it's impossible to do so in fact.
I also need to do this with equal facility across different serialization formats, so we can assess which one is working best. I have a generic serialization approach where the desired format is passed in as an argument, so don't want anything too messy or intricate for each different format.
I've hunted around and found various things on related topics - mostly to do with the opposite: not writing certain fields during serialization. What's out there seems to be quite complicated and at times hacky.
Is it possible to serialize an object differently to deserializing it using Json.Net?
JsonConvert .NET Serialize/Deserialize Read Only
Serialize Property, but Do Not Deserialize Property in Json.Net
Also it appears any approach is inconsistent between serialization formats. i.e. unlike the [*Ignore] attributes, there are no [*SerializeOnly] attributes (where * = JSON, XML, YAML).
Is there an easy way to do this across these serialization formats? Is there a single family of attributes that can help? Or is it idiosyncratic and hacky in each case?
...ANSWER
Answered 2018-Jun-17 at 13:15I have tested and applied this only to XML serialization, but it works for me:
When I want a property to be serialized, but not read back, I just declare an empty setter.
QUESTION
I have a list of employees and some method is adding/deleting the employee or editing the attributes of employees.
...ANSWER
Answered 2018-May-09 at 04:42Here I did a workaround like below. Hope this helps someone. (refer comments in code)
QUESTION
I want to compare 2 objects using javascript and list out the differences between the objects. I see there are libraries deep-object-diff which can let me do something similar, but I am looking for something which even lists the values changed from something to null or null to something. Whenever I try to use any library, I am able to list out the changes, but whenever I try to compare null with anything, it returns null.
So, if I have 2 object like
...ANSWER
Answered 2017-Dec-29 at 10:02You could do something like this.
The right is compared to the left object, so if a property is missing from the right it will be wrapped in Missing if the property is missing from the left it will be wrapped in Extra
QUESTION
So I have this scenario where I have a client-app which sends data (array of objects) to a server which then forwards the data to other clients connected to this server.
In the client-app, the data is constantly changing, meaning: Values change, new objects inside the array pop up, objects being removed, and so on ...
Now I want the other clients to always receive the latest data. And because I dont want the client-app to just push the whole new data to the server which then forwards the whole new data to the other clients, I decided to let the client-app only push the changes (using this library: https://www.npmjs.com/package/deep-object-diff).
The other clients then receive an array of objects with only the data that has actually changed and because they know the previous data array, I want them to "merge" the array of changes with the old data object.
My actual problem is the merging. I dont know how to properly do this. Especially if I have an array of objects without any key for the objects.
So my data looks something like this:
...ANSWER
Answered 2017-Oct-19 at 14:06You could use a sId Map for fast lookup:
QUESTION
I am trying to show a diff for two JSON objects in Angular 4 view, I am using this library (angular-object-diff) originally built for AngularJS.
Demo of that library: Link
I tried to import this JS library the following way:
JS file I am trying to import: angular-object-diff.js, doesnt have a exported variable
In my typings.d.ts ( I added the following):
ANSWER
Answered 2017-Sep-27 at 20:14The library doesn't export anything. It uses IIFE to not pollute global scope with local variables. It's impossible to reach local variables from the outside, this makes Module pattern so effective (and annoying).
The library uses AngularJS angular global and expects that it will exist. This creates a problem, because Angular 4 application should mock angular global in this case. Moreover, the code itself relies on AngularJS-specific units ($sce service).
The library should be forked and modified to suit the expectations. The mentions of angular should be removed. Considering that script will be executed in module scope, IIFE should be removed and appropriate exports should be added.
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