数组中唯一值_唯一数组值

分手后的思念是犯贱 2023-02-22 01:26 16阅读 0赞

数组中唯一值

When you look at any programming language, you see missing features that you find puzzling because the use case seems so common.  One such case is retrieving unique values from an array with JavaScript. Years ago I mentioned an [easy way of unique value management][] using objects instead of arrays, but that's not always an option and doesn't match every use case.

当您使用任何一种编程语言时，都会发现缺少的功能，这些功能令人困惑，因为用例似乎很常见。 一种这样的情况是使用JavaScript从数组中检索唯一值。 几年前，我提到了[一种][easy way of unique value management]使用对象而不是数组[进行唯一值管理][easy way of unique value management]的[简便方法][easy way of unique value management] ，但这并不总是一种选择，并且并不适合每个用例。

Want to retrieve a unique array of values from an array that may include duplicate values?  You can use new JavaScript spread operator with Set to get an array of unique values:

是否想从可能包含重复值的数组中检索值的唯一数组？ 您可以将新JavaScript Spread运算符与Set一起使用，以获取唯一值数组：

var j = [...new Set([1, 2, 3, 3])]
    >> [1, 2, 3]

Getting unique array values is another [awesome usage of the spread operator][].  And don't forget you can [merge object properties with the spread operator!][merge object properties with the spread operator]

获得唯一的数组值是[散布运算符的][awesome usage of the spread operator]另一种[很棒的用法][awesome usage of the spread operator] 。 并且不要忘记，您可以[将对象属性与传播运算符合并！][merge object properties with the spread operator]

There's no better feeling than being able to remove a library to complete a task that should be native to the language.  This trick brings us one step closer to that!

没有什么比删除库来完成该语言固有的任务更好的感觉了。 这个技巧使我们更接近了这一步！

> 翻译自: [https://davidwalsh.name/array-unique][https_davidwalsh.name_array-unique]

数组中唯一值

[easy way of unique value management]: https://davidwalsh.name/object-array-index
[awesome usage of the spread operator]: https://davidwalsh.name/spread-operator
[merge object properties with the spread operator]: https://davidwalsh.name/merge-objects
[https_davidwalsh.name_array-unique]: https://davidwalsh.name/array-unique