deep-freeze | recursively Object.freeze on objects and functions | Runtime Evironment library
kandi X-RAY | deep-freeze Summary
kandi X-RAY | deep-freeze Summary
recursively Object.freeze() on objects and functions
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Top functions reviewed by kandi - BETA
- Deep freeze the given object .
deep-freeze Key Features
deep-freeze Examples and Code Snippets
const deepFreeze = obj => {
Object.keys(obj).forEach(prop => {
if (typeof obj[prop] === 'object') deepFreeze(obj[prop]);
});
return Object.freeze(obj);
};
'use strict';
const val = deepFreeze([1, [2, 3]]);
val[0] = 3; // not allow
Community Discussions
Trending Discussions on deep-freeze
QUESTION
Been getting this error when running 'ng build' on my Angular 12.0.2 project
...ANSWER
Answered 2021-Jun-02 at 17:41We figured it out. As you can see in our packages.json
, we have a dependency on webpack
. It seems angular-devkit/build-angular
does as well. We believe this created the known issue of multiple webpacks colliding and causing issues. Removing our dependency on webpack
fixed the issue.
QUESTION
I am working on an app to teach myself React and Redux and I am running into an issue when trying to access the variables that have been added to the store.
I am able to add data to the store object and verify that the data is there by using console.log but when I try to drill down to the actual variable I want to access I am getting an error: "TypeError: Cannot read property 'status' of undefined".
When viewing the state I can see that the status is there: {"customerInfo":[],"loginInfo":[],"storeStatus":[{"status":false}]}
but then trying to access anything within state.storeStatus[0] (example: state.storeStatus[0].status) returns the error of being undefined.
Is there a different way that I should be trying to access that variable if I want to assign it to a new variable to be used in some conditional rendering?
storeStatusReducers.js
...ANSWER
Answered 2020-May-06 at 23:12Since your effect is running asynchronously, your data will not be available on initial render. That means trying to access a prop on the nonexistent array element will cause your app to crash.
The fact that your initial log statement appears to work is mosty likely because it's undefined
on the initial render but then the expected value on the second render. On the other hand, your second console.log
statement fails immediately and you never make it to a subsequent render.
To prevent this issue from happening, a common pattern is to use a short-circuit evaluation. For example:
QUESTION
I am new to React apps so please excuse me if my question has an easy answer. I have spent the last few days with Google and have not found a solution for my question.
At my new position, I have been asked to modify a current React app. The short of it is that this app was built before my time and is old. The app does not permit for a dev build. And since it does not allow for a dev build our development team can not see the component layout, props, or state along with any other goodies provided by the React Dev Tools.
My question is how do I make my app work properly with the React Dev Tools?
Other details that may help:
Files are located in ABC/app/src/common
Normally here at my employer, this would translate into a URL of:
www.ABC.com/app/
. Yet for some reason, this is not how things are set up.
Instead the app is served from a URL subdomain:
app.XYZ.com
Also, note that the URL www.XYZ.com
is not a React app - (not sure this is relevant)
Basically the build scripts create the bundle and the .min files are moved from the ABC/app/src/common
folder to app.XYZ/
.
package.JSON:
...ANSWER
Answered 2020-Feb-12 at 07:49Try running react-scripts start
in the root project folder.
The application should open a new browser window at http://localhost:3000 - then if you have the React DevTools Chrome extension installed you should be able to access the React DevTools tab
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