![]() ![]() On each change of state, render will be called. ![]() Once interval complete it will change the state value of msg to new. Output on initialization of component as it was the value set from the constructor of SampleConstructor. HTMl file to use above react components ReactDOM.render(, document.getElementById('root')) Remember: state is a plain JavaScript object. Initializing state is done by setting this.state to an object, like you can see above. Here 6 is the value set by the constructor function for the first time and value will keep changing and render will called on each change of cnt value.Ĭlass ChangeOnClick extends React.Component The Constructor According to the official documentation, the constructor is the right place to initialize state. In this example we are calling ChangeOnClick function, on its first call it will set the “cnt” variable as 6 and each click on it will get increment it’s a value by one and increased value will be visible to us. Examples to Implement Constructor in ReactĮxamples to implement constructor in react are given below: Example #1 because constructor initialize or called automatically it will set some products for customers instead of showing any blank page to him. Here constructor plays an important role, With the help of constructor we can set some basic and static products for the customer on initialization of component. Let me explain its working principle with one real-time example, Suppose you are designing a page for all available product listing for the customer, And we know all the product details are fetched from the server, hence till all products will fetch from other server customer need to wait.
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