findIndex javascript问题

Question

我试图在包含多个对象的数组中查找对象的索引。我已经在这方面挣扎了一段时间，并将其简化为您所看到的并且仍然无法获得它。请让我知道什么会起作用，这样我才能得到＆＃34;输入＆＃34;对象来自matchBetween("string1");

的字符串

matchBetween("string1");
matchBetween = function (result) {
        let params = [
            { param: "string1", input: "inputstring1"},
            { param: "string2", input: "inputstring2"}
            ];
        console.log(result, params, params.param ); //Output: "string1", (2)[{...}, {...
        let location = params.findIndex (x => Object.is(result, x));
        console.log(location); //outputs -1
        return params[location].input // 'Cannot read property 'input' of undefined'
    }; 

我尝试了多种方法，但我觉得这很容易解决，我只是错过了它。提前谢谢你！

Answer 1

Object.is(result, x)错了。

运行params.findIndex (x => {console.log(x); return false;});以查看每个x的外观

{param: "string1", input: "inputstring1"}
{param: "string2", input: "inputstring2"}

因此，您可以使用Jean提到的Object.is(result, x.param)，或result === x.param，或只是

params.find(x => x.param === result).input

注意，您需要在找不到结果时进行处理。

Answer 2

试试这个样本：

＆＃13;

＆＃13;

matchBetween = function (result) {
    let params = [
        { param: "string1", input: "inputstring1"},
        { param: "string2", input: "inputstring2"}
        ];
    console.log(result, params, params[0].param ); //Output: "string1", (2)[{...}, {...x=>x.param == result
    let location = params.findIndex (function(x) { return Object.is(result, x.param); });
    console.log(location); //outputs -1
    return params[location].input // 'Cannot read property 'input' of undefined'
}; 
console.log(matchBetween("string2"));

＆＃13;

＆＃13;

＆＃13;