JavaScript Tutorial 01 #Basic#

//object
    var book = {
        topic: "JavaScript",
        fat : true
    };
    book.topic = "CPP";

    //array
    var primes = [2,3,5,7];
    primes.length

    //
    var points = [
        {x:0, y:0},
        {x:1, y:1}
    ];
    var data = {
        trial1: [[1,2],[3,4]],
        trial2: [[2,3],[4,5]]
    };

    //function
    var square = function(x) {
        return x*x;
    };
    function plus1(x) {
        return x+1;
    }

    //object-oriented
    function Point(x,y) {
        this.x = x;
        this.y = y;
    }
    Point.prototype.r = function() {
        return Math.sqrt(this.x * this.x +this.y * this.y);
    };

    //types: primitive types and object type

    //
    var point = {x:1, y:1};
    "x" in point
    "z" in point
    "toString" in point
    //
    var d = new Date();
    d instanceof Date;

    typeof value == "string"

    //
    for(var p in o) {
        console.log(o[p]);
    }

    //
    with(document.forms[0]) {
        name.value = "";
        address.value = "";
    }