Depending on the type of business you run or the factors affecting your sector, you need to come up with a plan that outlines when you want to launch. Additionally, this plan should account for the amount of time your project will need to address difficult problems.

It works because in JavaScript, true && expression always evaluates to expression, and false && expression always evaluates to false. Therefore, if the condition is true, the element right after && will appear in the output. If it is false, React will ignore and skip it.

In JavaScript, class methods are not bound by default. If you forget to bind this.handleClick and pass it to onClick, this will be undefined when the function is actually called.

Another difference is that you cannot return false to prevent default behavior in React. You must call preventDefault explicitly

this.setState((state, props) => ({ counter: state.counter + props.increment }));

Do Not Modify State Directly For example, this will not re-render a component: // Wrong this.state.comment = 'Hello'; Instead, use setState(): // Correct this.setState({comment: 'Hello'}); The only place where you can assign this.state is the constructor.

State is similar to props, but it is private and fully controlled by the component.

React is pretty flexible but it has a single strict rule: All React components must act like pure functions with respect to their props.

We recommend naming props from the component’s own point of view rather than the context in which it is being used.

React treats components starting with lowercase letters as DOM tags. For example, <div /> represents an HTML div tag, but <Welcome /> represents a component and requires Welcome to be in scope.

Elements are what components are “made of”, and we encourage you to read this section before jumping ahead.

Warning: Since JSX is closer to JavaScript than to HTML, React DOM uses camelCase property naming convention instead of HTML attribute names. For example, class becomes className in JSX, and tabindex becomes tabIndex.

After compilation, JSX expressions become regular JavaScript function calls and evaluate to JavaScript objects.

You can put any valid JavaScript expression inside the curly braces in JSX. For example, 2 + 2, user.firstName, or formatName(user) are all valid JavaScript expressions.

Instead of artificially separating technologies by putting markup and logic in separate files, React separates concerns with loosely coupled units called “components” that contain both