closure 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();what is closure in javascript
function OuterFunction() {
var outerVariable = 100;
function InnerFunction() {
alert(outerVariable);
}
return InnerFunction;
}
var innerFunc = OuterFunction();closure 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 1closure 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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