Every article tagged Fundamentals, in one place.
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Short answer: === (strict equality) compares value and type with no conversion. == (loose equality) converts the operands to a common type first, which leads to surprising results. 1 === '1' // false - different types 1 == '1' // true - '1' converted to 1 0 ==...
Short answer: props are inputs passed from a parent; a component can't change them. State is data a component owns and updates over time, which triggers a re-render. function Counter({ step }) { // step is a prop const [count, setCount] = useState(0); // count...
A closure is a function that remembers the variables from the place where it was created, even after that outer function has returned. Closures are behind callbacks, React hooks, module patterns and much more. Lexical scope const greeting = 'Hello'; function o...
