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();What is Closures in JavaScript
/*A closure is the combination of a function bundled together (enclosed) with references
to its surrounding state (the lexical environment). In other words, a closure gives you
access to an outer function’s scope from an inner function. In JavaScript, closures are
created every time a function is created, at function creation time.*/
function init() {
var name = 'Mozilla'; // name is a local variable created by init
function displayName() { // displayName() is the inner function, a closure
alert(name); // use variable declared in the parent function
}
displayName();
}
init();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
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