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(); // 2js closure examples
function outer() {
var counter = 0; // Backpack or Closure
function incrementCounter() {
return counter++;
}
return incrementCounter;
}
const count = outer();
count(); // 0
count(); // 1
count(); // 2closure 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 1js 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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