为什么lodash不能从数组中找到最大值？

Question

我有下面的代码,我试图用来lodash从数组对象中找到最大值;

var a = [ { type: 'exam', score: 47.67196715489599 },
  { type: 'quiz', score: 41.55743490493954 },
  { type: 'homework', score: 70.4612811769744 },
  { type: 'homework', score: 48.60803337116214 } ];
 var _ = require("lodash")

 var b = _.max(a, function(o){return o.score;})
 console.log(b);

输出47.67196715489599不是最大值.我的代码出了什么问题？

Answer 1

Lodash _.max()不接受iteratee(回调)._.maxBy()改为使用:

var a = [{"type":"exam","score":47.67196715489599},{"type":"quiz","score":41.55743490493954},{"type":"homework","score":70.4612811769744},{"type":"homework","score":48.60803337116214}];


console.log(_.maxBy(a, function(o) {
  return o.score;
}));

// or using `_.property` iteratee shorthand

console.log(_.maxBy(a, 'score'));

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Answer 2

甚至更短：

var a = [{"type":"exam","score":47.67196715489599},{"type":"quiz","score":41.55743490493954},{"type":"homework","score":70.4612811769744},{"type":"homework","score":48.60803337116214}];

const b = _.maxBy(a, 'score');
console.log(b);

这使用_.propertyiteratee的简写。