Why anUncheck works

gistfile1.js

function anUnchecked()
{
    'use strict';
    return true;
}

function getPlayer()
{
    return {
        isWorthy: anUnchecked
    }
}

function determineIfWorthy(player)
{
    return player.isWorthy();
}

var players = [getPlayer(), getPlayer(), getPlayer()];
console.log(players.map(determineIfWorthy));

// [true, true, true]

// You can even borrow the function inline:
console.log(players.map(getPlayer().isWorthy));
// // [true, true, true]