JavaScript - Closures
function makeAdder(x) {
return function(y) {
return x + y;
};
}
var add5 = makeAdder(5);
var add10 = makeAdder(10);
console.log(add5(2)); // 7
console.log(add10(2)); // 12
//=====
//add5 and add10 are both closures.
//They share the same function body definition, but store different lexical environments.
//In add5's lexical environment, x is 5, while in the lexical environment for add10, x is 10.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();what is a closure in javascript
//Closures are the inner functions that are embedded in parent function
function getName(){
// print name function is the closure since it is child function of getName
function printName(){
return 'Kevin'
}
// return our function definition
return printName;
}
const checkNames = getName();
console.log(checkNames());Copyright © 2021 Codeinu
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