Javascript 为什么 lodash 不能从数组中找到最大值？
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why can't lodash find the max value from an array?
提问by Joey Yi Zhao
I have below code and I tried to use lodashto find the max value from an array object;
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);
the output is 47.67196715489599which is not the maximum value. What is wrong with my code?
输出47.67196715489599不是最大值。我的代码有什么问题？
回答by Ori Drori
Lodash's _.max()doesn't accept an iteratee (callback). Use _.maxBy()instead:
Lodash_.max()不接受迭代器（回调）。使用_.maxBy()来代替：
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>回答by Maurits Rijk
Or even shorter:
或者更短：
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);
This uses the _.propertyiteratee shorthand.
这使用_.propertyiteratee 速记。
