Categories
Mastering Development

Testing types of Prolog terms: slight problems

Here is some code to test the type/metatype of SWI-Prolog terms: % var,nonvar are meta-question about the state of computation, not about the term % Note: X can be a variable (if it is fresh) or a nonvar (if it is set) % but x can ever only be a nonvar typeof(X, var) :- var(X),!. […]

Categories
Cryptocurrency Ethereum Mastering Development

truffle test fails with `Error: Callback was already called.`

I have a single .sol contract that includes 2 libraries, 1 interface and 3 contracts A, B and C such that B is A and C is A, B. The contract C is the one I am interested in as it includes all the features I want. I have compiled this .sol file and migrated […]

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Development

How to close and re-open indexedDB database without reloading the page?

In attempting to catch errors related to indexedDB database requests and offer options to salvage the database, I’d like to offer the option of closing the database, re-opening it, and resetting the mapping data values held in RAM. Because the page is acted on by an extension, I don’t want the user to refresh the […]

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Development

Trailing comma error with prop typing in Vue.js

I’m using Typescript with Vue. I want to add typing for my props but lint giving me an error with trailing comma. In this case: 21:6 error Parsing error: Unexpected token, expected “,” 9 | type: Object, 10 | required: true > 11 | } as PropOptions<MenuItem[]>, | ^ 12 | }, 13 | data: […]

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Development

Why is Eunit insisting my function is returning {ok, value} when it’s not?

I’m doing something very simple: Reversing a list in Erlang without using BIFs. Here’s my attempt: %% —————————————————————————– %% Reverses the specified list. %% reverse(List) where: %% * List:list() is the list to be reversed. %% Returns: A new List with the order of its elements reversed. %% —————————————————————————– reverse(List) -> reverse2(List, []). %% —————————————————————————– […]

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Development

Calling a function inside react render

I have this line <td>{device.ID}</td> and I want to display the type of device based on the ID number, so that I can call function I tried below approach by reading this here <td>{getDeviceId(device.ID)}</td> /// Parsing error: Unexpected token, expected “,” Any Idea of what’s I am missing there?

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Development

golang test fails to caputure loging output

I am trying to test my UserRegister functionality, it takes http request. If user enters already existing email, UserRegister returns an error log (using logrus). logs “github.com/sirupsen/logrus” func UserRegister(res http.ResponseWriter, req *http.Request) { requestID := req.FormValue(“uid”) email := req.FormValue(“email”) logs.WithFields(logs.Fields{ “Service”: “User Service”, “package”: “register”, “function”: “UserRegister”, “uuid”: requestID, “email”: email, }).Info(“Received data to insert […]

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Development

Reducer – add new element

I have this store: const initialActors = { list: ‘Actor\’s lists’, actors: [ { name: ‘Angelina Jole’, involved: true }, { name: ‘Bratt Pitt’, involved: false }, ] } I have a reducer to add a new actor to my store: const actors = (state = initialActors, action) => { switch(action.type){ case ‘ADD_NEW’: return { […]

Categories
Development React

How to implement nested loop using map in react Js

I know that there is a lot of thread that already answer about this nested loop using map in react js problem, but I’am quite confused as how can I implemented it in my code. I tried several time but got an an error, this is some topic that I tried, but I can’t seem […]

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CSS Development React

How do I use a bulma css component in my react project?

I installed the bulma dependencies using the commands yarn add bulma yarn add node-sass but the navbar component doesn’t render when I try to run the server it gives this error in the terminal ./src/App.js Line 43:6: Parsing error: Unexpected token, expected “,” > 43 | <nav class=”navbar” role=”navigation” aria-label=”main navigation”> | ^ 44 | […]