如何在数组中搜索并返回匹配值答案

【问题标题】：how to search through the array and return the matching value如何在数组中搜索并返回匹配值
【发布时间】：2018-05-09 12:10:50
【问题描述】：

我有一个包含一些类名的数组，该数组中的所有值都以数字结尾。我想要一个函数，当我给它一个数字时，它会搜索该数组，并检查每个值的最后 3 位数字，以找到匹配的数字并返回该匹配值。所以可以说，我给它赋值200，它在数组中搜索并返回wi-owm-200。

我设法做到了，但它没有返回它。它确实找到了值，但是当它在函数之外时，它返回'undefined'。

这是我的代码：Fiddle

var owmIcon = ["wi-owm-200", "wi-owm-201", "wi-owm-202", "wi-owm-210", "wi-owm-211", "wi-owm-212", "wi-owm-221", "wi-owm-230", "wi-owm-231", "wi-owm-232", "wi-owm-300", "wi-owm-301", "wi-owm-302", "wi-owm-310", "wi-owm-311", "wi-owm-312", "wi-owm-313", "wi-owm-314", "wi-owm-321", "wi-owm-500", "wi-owm-501", "wi-owm-502", "wi-owm-503", "wi-owm-504", "wi-owm-511", "wi-owm-520", "wi-owm-521", "wi-owm-522", "wi-owm-531", "wi-owm-600", "wi-owm-601", "wi-owm-602", "wi-owm-611", "wi-owm-612", "wi-owm-615", "wi-owm-616", "wi-owm-620", "wi-owm-621", "wi-owm-622", "wi-owm-701", "wi-owm-711", "wi-owm-721", "wi-owm-731", "wi-owm-741", "wi-owm-761", "wi-owm-762", "wi-owm-771", "wi-owm-781", "wi-owm-800", "wi-owm-801", "wi-owm-802", "wi-owm-803", "wi-owm-804", "wi-owm-900", "wi-owm-901", "wi-owm-902", "wi-owm-903", "wi-owm-904", "wi-owm-905", "wi-owm-906", "wi-owm-957"];


var res = findOWMIcon("200");
console.log(res);


function findOWMIcon(num) {
  $.each(owmIcon, function(key, value) {
    var classNum = value.substr(value.length - 3);
    if (parseInt(num, 10) === parseInt(classNum, 10)) {
      console.log(value);
      return value;
    }
  });
}

&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;

知道如何解决吗？所以我可以在函数之外得到找到的值吗？

【问题讨论】：

为什么会返回word-200？数组中没有一个叫做那个的元素。
@Andy no word-200 只是示例。事实上它必须返回类似wi-owm-200 的东西。会更新帖子。

标签： javascript jquery arrays scope return

【解决方案1】：

这就足够了：

owmIcon.filter(e => e.slice(-3) == "200");

// Get all elements that ends in "01"
items = get_all_items().filter(e => e.slice(-2) == "01");
console.log(items);

function get_all_items(){
  return ["wi-owm-200", "wi-owm-201", "wi-owm-202", "wi-owm-210", "wi-owm-211", "wi-owm-212", "wi-owm-221", "wi-owm-230", "wi-owm-231", "wi-owm-232", "wi-owm-300", "wi-owm-301", "wi-owm-302", "wi-owm-310", "wi-owm-311", "wi-owm-312", "wi-owm-313", "wi-owm-314", "wi-owm-321", "wi-owm-500", "wi-owm-501", "wi-owm-502", "wi-owm-503", "wi-owm-504", "wi-owm-511", "wi-owm-520", "wi-owm-521", "wi-owm-522", "wi-owm-531", "wi-owm-600", "wi-owm-601", "wi-owm-602", "wi-owm-611", "wi-owm-612", "wi-owm-615", "wi-owm-616", "wi-owm-620", "wi-owm-621", "wi-owm-622", "wi-owm-701", "wi-owm-711", "wi-owm-721", "wi-owm-731", "wi-owm-741", "wi-owm-761", "wi-owm-762", "wi-owm-771", "wi-owm-781", "wi-owm-800", "wi-owm-801", "wi-owm-802", "wi-owm-803", "wi-owm-804", "wi-owm-900", "wi-owm-901", "wi-owm-902", "wi-owm-903", "wi-owm-904", "wi-owm-905", "wi-owm-906", "wi-owm-957"];
}

如果您关心向后兼容性（ES5 及之前的版本），请使用 function(e){ return e.slice(-3) == "200"; } 而不是 e => ...。

【讨论】：

也将匹配 1200 或 2200
@charlietfl 确实如此，如问题中所述：“它搜索该数组，检查每个值的最后 3 位。”
错过了...刚刚看到系列在 900 年代兴起
@DannyBoy 再次仔细阅读答案，尤其是最后一句。
@DannyBoy 顺便说一句，您可以通过使用Babel 将其转换为 ES5 来开始使用 ES6+ 代码。

【解决方案2】：

let data = ["wi-owm-200", "wi-owm-201", "wi-owm-202", "wi-owm-210", "wi-owm-211", "wi-owm-212", "wi-owm-221", "wi-owm-230", "wi-owm-231", "wi-owm-232", "wi-owm-300", "wi-owm-301", "wi-owm-302", "wi-owm-310", "wi-owm-311", "wi-owm-312", "wi-owm-313", "wi-owm-314", "wi-owm-321", "wi-owm-500", "wi-owm-501", "wi-owm-502", "wi-owm-503", "wi-owm-504", "wi-owm-511", "wi-owm-520", "wi-owm-521", "wi-owm-522", "wi-owm-531", "wi-owm-600", "wi-owm-601", "wi-owm-602", "wi-owm-611", "wi-owm-612", "wi-owm-615", "wi-owm-616", "wi-owm-620", "wi-owm-621", "wi-owm-622", "wi-owm-701", "wi-owm-711", "wi-owm-721", "wi-owm-731", "wi-owm-741", "wi-owm-761", "wi-owm-762", "wi-owm-771", "wi-owm-781", "wi-owm-800", "wi-owm-801", "wi-owm-802", "wi-owm-803", "wi-owm-804", "wi-owm-900", "wi-owm-901", "wi-owm-902", "wi-owm-903", "wi-owm-904", "wi-owm-905", "wi-owm-906", "wi-owm-957"];

// Suppose you want to get all elements that end with 200, so...

let filteredData = data.filter(item => item.slice(-3) === "200");

console.log(filteredData);

【讨论】：