Concatenating strings with `if` statements in JavaScript

Question

I\'m attempting to set up a script to concatenate some variables inside a string if they exist, in order to place the appropriate metadata tags into a rendered HTML

Answer 1

I might do something a little different (a little more akin to templating), mainly because I hate concatenated HTML done with Javascript:

var metadata_title = "Hello";
var metadata_author = "Me";
var metadata_date = "2011-09-07";

var template = "\
            \
                \
                \
                \
            \
            \
            \
            ";

var data = template.replace("#title#", metadata_title != undefined ? metadata_title : "")
                   .replace("#author#", metadata_author != undefined ? metadata_author : "")
                   .replace("#date#", metadata_date != undefined ? metadata_date : "");

Sure, there's a very small amount of additional overhead, but to me, it's way more readable.