Extant

Look at the Docco for now.

Note that Extant is SQL's COALESCE. It is generally useful and I pull it into any program that needs to perform the common default value if null intialization. I'll hold off when it can be done with ||, as in:

function invokeFoo (options) {
    options || (options = {})
    foo(options)
}

But the moment I'm reaching for the ternary operator, I use Extant.

var coalesce = require('extant')

function invokeFoo (count) {
    count = coalesce(count, 0)
    invokeFoo(count)
}

In the above, falsy values are valid values, so you must make an explicit check for null.