javascript - How to find index of object in array using multiple values with ES5? - Stack Overflow

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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;

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;

• javascript
• ecmascript-5

Share Improve this question Follow asked Jan 15, 2019 at 13:28 J.J.J.J. 1,11822 gold badges2828 silver badges6464 bronze badges 2

• So, to clarify - you have an array of objects. You want to find all indexes of those objects matching some condition and you can have more than one. Is that correct? Also, do you have to find indexes or can you work with just the objects? – VLAZ Commented Jan 15, 2019 at 13:31
• There should only be one object that has a particular order number and item number, however, if just looking up objects by item number there could be multiple objects that are matched, so that is why I want to add the purchase order number to the criteria as well. Indexes or directly working with the objects are both fine. – J.J. Commented Jan 15, 2019 at 13:34

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2 Answers 2

Sorted by: Reset to default 4

ES6+

You can use .findIndex()

https://developer.mozilla/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/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.

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

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