Pseudocode that's demonstrate how react hooks work under hood

index.js

let currentComponent;
let currentMemory;
let currentIndex;

function useState(initState) {
  if (currentIndex in currentMemory === false) {
    currentMemory.push(initState);
  }
  const state = currentMemory[currentIndex];
  currentIndex++;
  const myComponent = currentComponent;
  return [
    state,
    (newState) => {
      state = newState;
      render(myComponent);
    },
  ];
}

function render(Component) {
  currentComponent = Component;
  currentMemory = [];
  currentIndex = 0;

  const element = Component();

  renderToDOM(element);
}