javascript basics - I

javascript basics

by deshpandeakhil

JavaScript

var f = function(arg) {
    if(arg != null){
        document.write(arg); 
        document.write("<br/>"); 
    }else{document.write("<br/>");}
};

var f1 = function() {
    f("EQUALITY");
    var a = (1 == "1"); // will try to coalesce for comparison
    var b = (1 === "1"); // determines type without coalescing
    var c = (1 !== "1");
    f(a);f(b);f(c);f();
    
    f("TYPEOF");
    var d = 1; var d1 = 1.5; var e = "true"; var g = true; 
    f(typeof d); f(typeof d1); f(typeof e); f(typeof g); f();
    
    f("Null and Undefined");
    f("null similar to c# is a variable which doesnt have a value (an object with no reference). Undefined is when a variable has not been defined in the javascript file yet."); f();
    
    f("NUMBER TYPE");
    var n1 = 1; var n2 = 1.2; var n3 = 020; var n4 = 0xaaaa; var n5 = 1.34e6; 
    var n6 = Number.MIN_VALUE; var n7 = Number.MAX_VALUE;
    var n8 = Number.POSITIVE_INFINITY; var n9 = Number.NEGATIVE_INFINITY;
    var n10 = NaN;
    f(n1); f(n2); f("octal " + n3); f("hex " + n4); f(n5); f(n6); f(n7);
    f(n8); f(n9); f(n10); f();
    
    f("OBJECT AND ARRAY");
    var data = {
        name:"abc", 
        "name with space":"cde", 
        dowork: function(arg){f(arg);}
    };
    f(typeof data);f(data.name);f(data['name with space']);
    var arr = ["a", 1, data];
    f(typeof arr);f(arr);f(arr[2].name);f(arr[2].dowork("code"));
}();