Using proxy you can intercept the fundamental functions for objects. What are fundamental functions? When you do myObject.anyKey it will invoke get function and when you do myObject.anyOtherKey = "Some Value" you are invoking set function. All functions that you can intercept are mentioned here How you can intercept ? …

Content — Event bubbling and Capturing Event delegation When the user interacts with dom with an event like click / keyup that event is propagated in cycle Event bubbling and Capturing Capturing is when the event is traveling down to the clicked item and bubbling is when the event is going up ( like a bubble…

Function currying is way to use same arguments in the sequence of functions. function someFunction(radius,numberOfCircles){ const area = Math.PI * radius * radius return function (){ const totalArea = area * numberOfCircles return totalArea } } const heavyFunctionProcessed = someFunction(5) const totalAreaOF3Circles = heavyFunctionProcessed(3) const totalAreaOF4Circles = heavyFunctionProcessed(4) ...

When you define a function in JS it will be bundled with all the variables that are being used inside that function. Example function s() { let a = 1 function b() { console.log(a) } b() } s() Now function b is aware of value a. If we run this…

In js we can use variables or functions before they are declared. console.log(a); var a = 2; This will not through any error and the output of the above code is undefined Why is that ? Js run code in 2 steps. Memory allocation Code execution In memory allocation js…

I have created a small CRUD app and for that this is DB design ( ER diagram ). Entity

Sharing states and functions between components ? This can be done using React Context api I believe you already have existing react app and you want to use Context api. So i am taking example in which we will pass theme for app to route’s components in src create new…

Join is creating new table ( virtual ) by combining tables Inner join Left join Right join Tables are Creating 2 tables Table A — Person Table B — Car CREATE TABLE car ( id BIGSERIAL NOT NULL PRIMARY KEY, model VARCHAR(100) NOT NULL, price NUMERIC(19,2) NOT NULL ) Add…

React is growing day by day. We can now create PWA/TWAs using it and for lot of developers developing IoT based solutions internet is the backbone of system. Problems Websites usually miss behave on low network We might not able to render everything app and we can build light weight…