JAVASCRIPT

javascript Returning a Function

function greet(name) {
    function displayName() {
        console.log('Hi' + ' ' + name);
    }

    // returning a function
    return displayName;
}

const g1 = greet('John');
console.log(g1); // returns the function definition
g1(); // calling the function

javascript return function

// Javascript double parentheses
// first function call result in a function that is called

function a() {
        return (name = 'b') => console.log(`I'm function ${name} produced by a()`);
}

a()();
a()('b2');

// result :
// I'm function b produced by a()
// I'm function b2 produced by a()