javascript：对象可以从字面上替换数组吗？

Question

Say I just want a variable to hold a bunch of information, and the order is not important . For example, i have a variable players that hold all the information of players in a game. If I use an object to hold all the information, isn't it better than using an array to do so in every possible way?

var players = [{ name: 'john', age: '10' }, { name: 'lily', age: '11' }];

versus

var players = { john: { name: 'john', age: '10' }, lily: { name: 'lily', age: '11' } };

If I count the number of players, or to access/edit a player's information directly, isn't using object better than array in every possible way?

If so, can object literally replace array in any non-ordered situation?

Answer 1

You lose access to all of the built-in array methods. What if you ever wanted a sorted list? I can imagine dozens of scenarios where you would want to have an Array.

What do you gain? Access to objects in your array by name? Arrays are objects, so you can just extend the array to get that:

var players = [{ name: 'john', age: '10' }, { name: 'lily', age: '11' }];
players.forEach(function (player) {
    players[player.name] = player;
});
console.log(player[0] === player.john); // true!