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();js closure examples
function outer() {
var counter = 0; // Backpack or Closure
function incrementCounter() {
return counter++;
}
return incrementCounter;
}
const count = outer();
count(); // 0
count(); // 1
count(); // 2what 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
function OuterFunction() {
var outerVariable = 1;
function InnerFunction() {
alert(outerVariable);
}
InnerFunction();
}closure
var counter = (function() { //exposed function references private state (the outer function’s scope / lexical environment) after outer returns.
var privateCounter = 0;
function changeBy(val) { privateCounter += val; }
return { increment: function() {changeBy(1); },
decrement: function() {changeBy(-1);},
value: function() {return privateCounter; }
};
})();
counter.increment(); counter.increment();
counter.decrement();
counter.value(); // 1Copyright © 2021 Codeinu
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