將下劃線的對象數組映射到ID爲key的新對象

Question

如何將此對象數組映射到新對象的數組，其中對象的ID是鍵並且其值是對象？

var players = [{id: 2, score: 5}, {id: 3, score: 10}] 

var mapped = _.map(players, function(x) { return {x.id: x}}) 

// desired output = [{2: {id: 2, score: 4}, {3: {id: 3, score: 10}} ] 

我得到一個語法錯誤試圖在你的JS小提琴你不包括underscore上述Uncaught SyntaxError: Unexpected token .(…)

JSFiddle

Answer 1

首先，但這將工作：

var mapped = _.map(players, function(player) { 
    var playerObj = {}; 
    playerObj[player.id] = player; 
    return playerObj; 
}) 

Answer 2

如果你很高興使用ES6功能，那麼你可以使用一個箭頭函數，它使用一個計算屬性名稱：

var mapped = _.map(players, player => ({ [player.id] : player}));