React is a popular JavaScript library for building user interfaces, while TypeScript is a superset of JavaScript that adds static typing and other features to the language. Together, they form a powerful combination for building robust web applications.
TypeScript provides several benefits over plain JavaScript, including better code organization, improved code readability, and enhanced error checking. By adding static typing to JavaScript, TypeScript helps catch errors at compile time rather than runtime, which can save developers time and effort in debugging.
React, on the other hand, provides a declarative approach to building user interfaces, making it easier to manage complex UI components. With React, developers can create reusable UI components that can be easily composed to build complex applications.
When combined, React and TypeScript provide a powerful toolset for building scalable and maintainable web applications. TypeScript’s static typing helps catch errors early in the development process, while React’s declarative approach simplifies the creation of complex UI components.
This cheat sheet provides an extensive list of React TypeScript concepts and their descriptions.
Table of Contents
React Components
Concept Description Function Component A component that is defined as a function. It takes in props as an argument and returns JSX. Class Component A component that is defined as a class. It has a render method that returns JSX. Pure Component A component that only re-renders when its props or state change. Higher-Order Component A function that takes in a component and returns a new component with additional functionality. Render Prop A technique for sharing code between components using a prop whose value is a function.
Props and State
Concept Description Props Short for “”properties””, props are read-only data that are passed down from a parent component to a child component. State Data that is managed within a component and can be changed over time. setState A method used to update the state of a component. It takes in an object that represents the new state. defaultProps A property that can be set on a component to provide default values for its props. propTypes A property that can be set on a component to define the types of its props.
Hooks
Concept Description useState A hook that allows a functional component to use state. It returns an array with the current state value and a function to update it. useEffect A hook that allows a functional component to perform side effects. It takes in a function that will be executed after every render. useContext A hook that allows a functional component to access a context object. useRef A hook that returns a mutable ref object that can be used to store a value across renders. useReducer A hook that allows a functional component to use a reducer function to manage state. useCallback A hook that returns a memoized callback function. useMemo A hook that returns a memoized value.
Event Handling
Concept Description onClick An event that is triggered when an element is clicked. onChange An event that is triggered when the value of an input element changes. onSubmit An event that is triggered when a form is submitted. onKeyPress An event that is triggered when a key is pressed down. onKeyUp An event that is triggered when a key is released.
Conditional Rendering
Concept Description if statement A JavaScript statement that allows for conditional rendering. ternary operator A shorthand way of writing an if statement. && operator A shorthand way of writing an if statement that only renders if a condition is true. switch statement A JavaScript statement that allows for multiple conditional renderings.
Lists and Keys
Concept Description map method A JavaScript method that allows for rendering a list of items. key prop A prop that is used to give each item in a list a unique identifier. index A value that is automatically assigned to each item in a list.
Forms
Concept Description Controlled Component A form element that is controlled by React state. Uncontrolled Component A form element that is not controlled by React state. onSubmit An event that is triggered when a form is submitted. onChange An event that is triggered when the value of an input element changes.
Lifecycle Methods
Concept Description componentDidMount A method that is called after a component is mounted. componentDidUpdate A method that is called after a component is updated. componentWillUnmount A method that is called before a component is unmounted.
TypeScript Interfaces
Concept Description Interface A TypeScript construct that defines the shape of an object. Props Interface An interface that defines the props of a component. State Interface An interface that defines the state of a component.
TypeScript Generics
Concept Description Generic A TypeScript construct that allows for the creation of reusable code. React.FC A generic type that defines a function component. React.Component A generic type that defines a class component.
References