closure.js

const globalVariable = 'just variable';

const outerFunction = () => {
  const outerFunctionVariable = 'values';

  const innerFunction = () => {
    const innerFunctionVariable = 'new Value';
    console.log(globalVariable); // just variable
    console.log(innerFunctionVariable); // new Value
    console.log(outerFunctionVariable); // values
  };

  return innerFunction();
};