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Mobile Phones/Cell Phones is the fundamental element in every moment or second in our life. But this most useable phone has some health effect that are...
Read articleProgramming languages are the foundation of software development and computer science. They provide a medium through which humans can instruct machines to perform specific tasks. Here’s...
Read articleAnd note some fundamentals of Promise – When you create a new Promise, you’re really just creating a plain old JavaScript object. This object can invoke...
Read articleThis tutorial teaches FIWARE users how to alter the context programmatically. The tutorial builds on the entities created in the previous stock management example and enables a user...
Read articleIn this file, you will write the functions that dispatch an action. These functions will be linked to your component props by the container’s mapDispatchToProps function....
Read articleA lifecycle hook that is called after Angular has fully initialized a component’s view. Define an ngAfterViewInit() method to handle any additional initialization tasks. interface AfterViewInit...
Read articleAggregation in MongoDB is nothing but an operation used to process the data that returns the computed results. Aggregation basically groups the data from multiple documents...
Read articleFiber, the new React reconciliation algorithm, has the ability to start and stop rendering as needed for performance benefits. One of the trade-offs of this is...
Read articleFirst a re-cap of the basic CSS Chain/Descendant Selector 1> Chain Selectors – https://stackoverflow.com/questions/13444647/css-class-definition-with-multiple-identifiers .class1.class2 will match only the elements that have both of the classes defined....
Read articleBasically, the Company asked to create an Android “screen” that would allow a user to enter and submit the following data from an American Express, Discover,...
Read articleAccording to original Documentation the pipable operator is that function take observables as a input and it returns another observable .previous observable stays unmodified. pipe(...fns: UnaryFunction<any,...
Read articleOne of the main goals of Angular is to help the developer create reusable and composable components. I think ng-content is one of the simplest ways...
Read articleWhile useReducer with its reducer is a part of how Redux works, it isn’t Redux. The useReducer function is tightly coupled to its reducer which holds...
Read articleuseReducer hook accepts two arguments first argument is reducer function and second argument is initial app state then it return array with two elements – state...
Read articleThe basic flow is like below const [loading, setLoading] = useState(false); ... setLoading(true); doSomething(); // <--- when here, loading is still false. Setting state like above...
Read articleReplacing componentWillUnmount with useEffect() componentWillUnmount() { console.log('will unmount'); } // Now to replicate the above, just return a function inside useEffect() which will do the same...
Read articleProblem – Effect re-run endlessly when using an array as a second argument for useEffect which is not the case when I use the array.length instead...
Read articleThe problem around dependency array I trying to wrap my head around the new hooks api of react. Specifically, I’m trying to construct the classic use...
Read articleMutations, subscriptions, timers, logging, and other side effects are not allowed inside the main body of a function component (referred to as React’s render phase). Doing...
Read articleFetching Hacker News hits data – The App component shows a list of items (hits = Hacker News articles). The state and state update function come...
Read articleStarting with 18.0, React includes a stable implementation of React Hooks for: React DOM React Native React DOM Server React Test Renderer React Shallow Renderer Note...
Read articleA> When shallow comparing scalar values (numbers, strings) it compares their values. When comparing objects, it does not compare their attributes – only their references are...
Read articleFiber, the new React reconciliation algorithm, has the ability to start and stop rendering as needed for performance benefits. One of the trade-offs of this is...
Read articleFirst of all, from a blog post in late March 2018, it was announced that the React lifecycle methods componentWillReceiveProps, componentWillMount, and componentWillUpdate will be deprecated in a future version...
Read articleFirst of all, from a blog post in late March 2018, it was announced that the React lifecycle methods componentWillReceiveProps, componentWillMount, and componentWillUpdate will be deprecated in a future version...
Read articlecomponentWillMount is called before the render method is executed. It is important to note that setting the state in this phase WILL NOT TRIGGER a RE-RENDERING. componentWillMount();...
Read articleJavaScript is single threaded, that means only one statement is executed at a time. As the JS engine processes our script line by line, it uses...
Read articleTransform the following code with sequential execution. I want to fire second request based on one value returned by the first request. For example, the Fetch...
Read articleAsync/await is a language structure that complements promises. It allows us to work with promises with less boilerplate. For example, the following definitions are equivalent: function...
Read articleA function passed to then can also return another promise. This allows asynchronous operations to be chained together, so that they are guaranteed to happen in...
Read articleA promise is an object that wraps an asynchronous operation and notifies when it’s done. This sounds exactly like callbacks, but the important differences are in...
Read articleKey Point – With the .then() method, we can chain our ASYNCHRONOUS calls in a SYNCHRONOUS manner. So, within the Promise block, I am converting few...
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