javascript - lodash.uniq 不工作

Question

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.6/lodash.min.js"></script>

<script>
    var topicData = []; //some data here

    var topicList = topicData.map((d) => {
        return d.topic;
    })
    _.uniq(topicList); //not work, still the old array

</script>

请问是我导入库错误还是其他原因。感谢您的帮助。

Answer 1

uniq返回一个新数组而不是改变现有数组。

来自文档:

Creates a duplicate-free version of an array, using SameValueZero for equality comparisons, in which only the first occurrence of each element is kept. The order of result values is determined by the order they occur in the array.

所以你应该做类似下面的事情。

const uniqueTopicList = _.uniq(topicList)