Answers for "practical example of closure in javascript"

closure in javascript

// closure in javascript
-> A closure gives you access to an outer function’s scope
   from an inner function

const outerFun = (a) => {
  let b = 10;
  // inner func can use variable/parameter of outer funcion
  const innerFun = () => {
    let sum = a + b; 
    console.log(sum);
  }
  return innerFun;
}
let inner = outerFun(5);
inner();

closure in javascript

function makeFunc() {
  var name = 'Mozilla';
  function displayName() {
    alert(name);
  }
  return displayName;
}

var myFunc = makeFunc();
myFunc();