dot path; dot({ prop: { inner: 1 } }, 'prop.inner') == 1

dot.js

// dot path; dot({ prop: { inner: 1 } }, 'prop.inner') == 1
function dot (o, path) {
    if (!path)
        return o

    var p = path.split('.')
    while (p.length > 0) {
        o = o[p.shift()]
        if (o == undefined)
            break
    }
    return o
}