Some code to demonstrate global and local scope in JavaScript.

scope.js

ramsay = "chef"; // global variable 'ramsay'
 
function hellKitchen() {
    knd = "chef"; // global variable 'knd'
}
 
function hellKitchen101() {
    var chuckNorris = "chef"; // local variable 'chuckNorris' to this function
    
    // watch out! this function 'assistant()' is locally scoped too
    // can't call it outside of hellKitchen101
    function assistant() {   
        console.log("I'm assistant");
    }
}
 
function myKitchen() {
    console.log(ramsay);      // of course 'ramsay' is "chef"
    console.log(knd);         // 'knd' is "chef" ! :p
    console.log(chuckNorris); // error raised, 'chuckNorris' is not defined !
}

hellKitchen();
hellKitchen1010();
myKitchen();