closures in javascript
// A closure is a function having access to the parent scope,
// even after the parent function has popped.
function greeting() {
let message = 'Hi';
function sayHi() {
console.log(message);
}
return sayHi;
}
let hi = greeting();
hi(); // still can access the message variableclosure in javascript
-->closure in javascript
//closure is the combination of function and the lexical enviornment in
//which the function is defined.closure give you access to the functions
//and variables outside the function.
function outer(){
const outerData ="outer";
function inner(){
const innerData="inner";
console.log(`${outerData} and{innerData}`);
}
inner();
}
outer();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 20closure in javascript
//Closures
Closures means a function bind together with its lexical environment
OR
You can say a function along with its lexical scope bundle together forms
a closure
OR
In other words, a closure gives you access to an outer function's
scope from an inner function.
//Example
function x(){
var a = 7;
function y(){ //function y bind with its lexical enviroment
console.log(a);
}
a = 100;
return y;
}
var z = x();
console.log(z) //Output is 100closure in javascript
A closure is a function bundeled together with its lexical scopeCopyright © 2021 Codeinu
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