Determine if the object has a property and value in javascript

Use the some Array method to test your function for each value of the array: function hasValue(obj, key, value) { return obj.hasOwnProperty(key) && obj[key] === value; } var test = [{name : “joey”, age: 15}, {name: “hell”, age: 12}] console.log(test.some(function(boy) { return hasValue(boy, “age”, 12); })); // => true – there is a twelve-year-old boy … Read more

Django cannot find static files. Need a second pair of eyes, I’m going crazy

do the following: If you are in DEBUG, set STATICFILES_DIRS = (“path/to/static”) variable in your settings.py. It should then work only in DEBUG mode. If you want it to also work in deploy mode, set STATIC_ROOT = (“path/to/static_root”) variable in the settings.py. Then, execute python manage.py collectstatic and it should also work. And now, for … Read more

How to exclude / disable Redux devtools in production build or disconnect?

For hiding the Redux from devtools pay attention to the following code: import { createStore, applyMiddleware, compose } from ‘redux’; import createSagaMiddleware from ‘redux-saga’; import reducer from ‘~/redux/reducers’; import mySaga from ‘~/redux/sagas’; import { nodeEnv } from ‘~/utils/config’; const composeEnhancers = (nodeEnv !== ‘production’ && typeof window !== ‘undefined’ && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__) || compose; const sagaMiddleware … Read more

Check internet connection in web using Angular 4

We don’t need any libraries for this however public onlineOffline: boolean = navigator.onLine; will do the trick but this is just a one time check. We need to treat this value as an observable so whenever the online status change we are updated. For this rxjs will help. Import these import { Observable, Observer, fromEvent, … Read more

What’s the difference between WebSocket and plain socket communication?

webSockets and regular sockets are not the same thing. A webSocket runs over a regular socket, but runs its own connection scheme, security scheme and framing protocol on top of the regular socket and both endpoints must follow those additional steps for a connection to even be made. You can see the webSocket protocol here: … Read more

Difference between Notifications API and Push API from Web perspective

NOTIFICATION API The Notifications API lets a web page or app send notifications that are displayed outside the page at the system level; this lets web apps send information to a user even if the application is idle or in the background. This article looks at the basics of using this API in your own … Read more

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