A function is referentially transparent if it can be replaced with its output value without changing the program's behavior. It is a key property of pure functions.
Example:
// Referentially Transparent
function add(a, b) {
return a + b;
}
const result = add(2, 3); // Can replace 'add(2, 3)' with 5
console.log(result); // 5
// Not Referentially Transparent
let count = 0;
function increment() {
return ++count;
}Tags: advanced, JavaScript, Functional Programming