Underscore map array of object to new object with id as key

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First of all, in your JS Fiddle you were not including underscore, but this will work:

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

If you're happy using ES6 functionality then you could use an arrow function which makes use of a computed property name:

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

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