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();what is closure in javascript
function OuterFunction() {
var outerVariable = 100;
function InnerFunction() {
alert(outerVariable);
}
return InnerFunction;
}
var innerFunc = OuterFunction();closure in javascript
function makeFunc() {
var name = 'Mozilla';
function displayName() {
alert(name);
}
return displayName;
}
var myFunc = makeFunc();
myFunc();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 1A closure Function
var returns_a_func = function () {
var word = 'I can see inside ' function sentence(){ var word2 = 'I can also see outside. ' console.log(word + 'and ' + word2) } return sentence;
}var finalSentence = returns_a_func()finalSentence()js closure
// global scope
var e = 10;
function sum(a){
return function(b){
return function(c){
// outer functions scope
return function(d){
// local scope
return a + b + c + d + e;
}
}
}
}
console.log(sum(1)(2)(3)(4)); // log 20
// You can also write without anonymous functions:
// global scope
var e = 10;
function sum(a){
return function sum2(b){
return function sum3(c){
// outer functions scope
return function sum4(d){
// local scope
return a + b + c + d + e;
}
}
}
}
var sum2 = sum(1);
var sum3 = sum2(2);
var sum4 = sum3(3);
var result = sum4(4);
console.log(result) //log 20Copyright © 2021 Codeinu
Forgot your account's password or having trouble logging into your Account? Don't worry, we'll help you to get back your account. Enter your email address and we'll send you a recovery link to reset your password. If you are experiencing problems resetting your password contact us
