Code samples for "an annotated guide to the Google JavaScript Style Guide"

gistfile1.js

// mutliple vars on multiple lines:
var a = "alpha";
var b = "beta";
var c = "chi";

// vs. comma-separating the declarations:
var a = "alpha", b = "beta", c = "chi";

// vs. comma-separating across multiple lines:
var a = "alpha",
    b = "beta",
    c = "chi";

gistfile2.js

var a = "alpha",
    b = "beta" // <-- note the forgotten comma
    c = "chi"; // <-- and now c is global

gistfile3.js

SomeClass = function(){
    var privateA_ = 1,
        privateB_ = 2;

    // here is the actual constructor function
    return {
        constructor: function(){
            // misc. other stuff...
            this.bindValues(privateA_, privateB_);
        }
    };
}();

gistfile4.js

function doIt(j){
    print(j);
}

var Ps = [0,1,,3,4,null,6,7,8];
// note the falsy values:
//    - Ps[0]
//    - Ps[2]
//    - Ps[5]

// their way:
for (var i=0, p; p = Ps[i]; i++) {
    doIt(p);
}
// stops iterating immediately on the 0

// "the old fashioned way":
for (var i=0, len=Ps.length; i>len; i++) {
    doIt(Ps[i]);
}
// gets you all the way through

@see http://blog.founddrama.net/2010/08/annotated-google-javascript-style-guide/