First failed Here is the package.json Error: package.json in functions directory has an engines field which is unsupported. Valid choices are: {“node”: 10|12|14|16} Deploys to runtimes below Node.js 10 are now disabled in the Firebase CLI. Existing Node.js 8 functions will stop executing at a futu…
Tag: javascript
Losing object reference in Javascript with await
I was learning the event loop of Js and tried to run this function: On running this code gave output as follows: I am not able to understand why did a lose its value (the object assignment). I have searched for this behavior but was not able to understand from the answers. Can someone please explain what is t…
How do you achieve the below code in react-native when user presses a button
This is how we dynamically add elements in vanilla java script,how could this be achieved in react-native. Answer The logic for this remains the same in both react and react-native. You need a state that contains the list of contents and must map that state to react components. On Button press, you have to ap…
JS Firebase Database Error db.ref is not a function
Hi I am trying to implement firebase realtime database API in my website, I am following this documentation: https://firebase.google.com/docs/database/admin/save-data#node.js but I get this error: this is my code: What am I doing wrong? Could the version I am using be incorrect? Answer You’re mixing the…
Change the color of an individual node
is it possible to change an individual node’s colour in an eChart treemap? I tried assigning a color property but the color does not change. I’ve gotten the label to change but i want the overall background color I have tried by having a color property under series-treemap.data as the documentatio…
Add Intl.Locale polyfill only when needed (How to block script tag with async functions)
I am trying to add Intl polyfill to an ember app, but have run into the issue that I need to add a script tag that executes async functions before evaluating other script tags. In ember I can add a new <script> tag to index.html, that is placed before the emberjs tags: Everything works fine when assets/…
Unhandled Rejection (TypeError): Cannot read properties of null (reading ‘product’)
This error appears to me when I add something to the shopping cart . I’ve checked the code many times, but I still can’t find the solution, I don’t know how to make it work. code in cartActions.js code in cardReducers.js I think the problem comes from here, but I don’t know exactly whe…
how to return in connection.query
I have a problem… I wanted to return “A” but The result was “B” I don’t know what to do Please help me my code: My results Answer You are mixing here callback with promises. To reach what you want, wrap your function in a promise:
Mongodb: How to group the result of a $lookup and map them to a list objects that contain a matching key?
I have classroom document which contain ‘modules’, the whole document looks like this: I also have assignment documents as such: My question is how could do aggregation such that if I want to do a lookup on the assignments for the classroom, I am able to group the assignment documents by moduleId …
How to call GET by axios has Bearer token?
I am newbie in React and JavaScript development. I have file http-common.js File account.js This stuff works ok: I try hard for a GET request, but not success. I don’t know how to attach Bearer token to request. Please help me call GET request then return data. Answer Here is a documented example of how…