The comma operator

commaoperator.js

//The comma operator is useful to execute series ouf expressions

function print_hello(){
    console.log('Hello');
    return 'Hello';
}

function print_world(){
    console.log('World');
    return 'World';
}

function print_js(){
    console.log('JavaScript');
    return 'JavaScript';
}

var output = (print_hello(),print_world(),print_js()); 
/*
Above code prints
Hello
World
JavaScript
and returns JavaScript to variable output
*/
console.log(output); //prints JavaScript