JavaScript: Prop: Property of. Thanks to Christian Johansen.

prop.js

// If I define the 'prop' function
function prop(name) {
    return function (object) {
        return object[name];
    };
}

// Instead of this
var str = "Mentioned by " + tweeps.map(function (t) {
    return t.name;
}).join(", ");

// I can do this
var str = "Mentioned by " + tweeps.map(prop("name")).join(", ");