Javascript/Closure.js at main · Anilnayak126/Javascript · GitHub

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// closure  = a function defined inside of another function,
//            the inner function has access to the variables
//            and scope of the outer function.

//            Allow fro  private variable and state maintenance
//            Used frequently in JS freameworks:react,vue,Angular


//----------------------------- Example -1
// function outer(){
//     let message = "Hello  anil"

//     function inner(){
//         console.log(message);

//     }
//     inner()
// }


// outer()


// -------------------------------example-2

// function createCounter(){
//     let count = 0;

//     function increment(){
//         count++;
//         console.log(`count increased: ${count}`);


//     }
//     function getcount(){
//         return count
//     }

//     return {increment,getcount}
// }

// const counter = createCounter()


// counter.increment()
// counter.increment()
// counter.increment()

// console.log(`the total  count is ${counter.getcount()}`);

//-------------------------------- example -3
function creategame(){

    let score = 0;

    function increase(count) {
        score += count;
        console.log(`+ ${count}`);
    }

    function dicrease(count) {
        score -= count;
        console.log(`- ${count}`);

    }

    function getscore() {
        console.log(`the total score is ${score}`);
    }
 return {increase,getscore,dicrease}
}


let a =  creategame();


a.increase(2)
a.getscore()