why can't lodash find the max value from an array?

Question

I have below code and I tried to use lodash to find the max value from an array object;

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 47.67196715489599 which is not the maximum value. What is wrong with my code?

Answer 1

Lodash's _.max() doesn't accept an iteratee (callback). Use _.maxBy() instead:

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

Or even shorter:

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 _.property iteratee shorthand.