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
var counter = (function() {
var privateCounter = 0;
function changeBy(val) {
privateCounter += val;
}
return {
increment: function() {
changeBy(1);
},
decrement: function() {
changeBy(-1);
},
value: function() {
return privateCounter;
}
};
})();
console.log(counter.value()); // logs 0
counter.increment();
counter.increment();
console.log(counter.value()); // logs 2
counter.decrement();
console.log(counter.value()); // logs 1Copyright © 2021 Codeinu
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