如何在ES5中使用多个值在数组中查找对象的索引？

Question

I am currently looking up objects in an array using one value, item number. However, if there happened to be multiple orders that both had the same item number on them, how could the particular object index be looked up using both values?

Object is structured in such a manner:

var object = {
    line: line,
    poNumber: purchaseOrder,
    item: item
};

Here is how I am looking the objects up now:

var posArrInd = posArr.map(function (x) { return x.item; }).indexOf(String(item));
var po = posArr[posArrInd];
var poLine = po.line;

Answer 1

Sounds like you could just use filter if I am reading your question correctly. For example:

 var theItem = 'however your item numbers look'
 var matches = posArr.filter(function(x) { return x.item === theItem })

This will return an array of all things in posArr that have a particular item number specified in theItem

Answer 2

ES6+

You can use .findIndex()

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex

var found = items.findIndex(function(itm) {
   return itm.number1 === number1 && itm.number2 === number2;
});

ES5:

Using .filter():

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

var foundItems = items.filter(function(itm) {
   return itm.number1 === number1 && itm.number2 === number2;
});

if (foundItems && foundItems.length > 0) {
 var itemYouWant = foundItems[0];
}

Getting the index--you can have the index value returned as part of the filter method. Check out the docs for more examples.