javascript - Querying Typescript array collection based on key - Stack Overflow

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I am new to Typescript. I have an Array of type in typescript.Basically containing the collection elements as

"ID": "669a8156-528c-43ba-8ed0-d07874534d1c",
"Name": "Temple",
"DeviceCount": "0",
"SiteCount": "0"

---

"ID": "5965ee85-2300-4c95-8743-b626f744082f",
"Name": "Building",
"DeviceCount": "2",
"SiteCount": "3"

---

..so on

How do I query the Name property from the collection if I have the ID

i.e., something similar to LINQ type of expression

var result = array.Where(item => item.ID == ID);

I am new to Typescript. I have an Array of type in typescript.Basically containing the collection elements as

"ID": "669a8156-528c-43ba-8ed0-d07874534d1c",
"Name": "Temple",
"DeviceCount": "0",
"SiteCount": "0"

---

"ID": "5965ee85-2300-4c95-8743-b626f744082f",
"Name": "Building",
"DeviceCount": "2",
"SiteCount": "3"

---

..so on

How do I query the Name property from the collection if I have the ID

i.e., something similar to LINQ type of expression

var result = array.Where(item => item.ID == ID);

• javascript
• linq
• collections
• typescript

Share Improve this question Follow edited Jun 23, 2016 at 4:21 Ryan Cavanaugh 221k5959 gold badges278278 silver badges235235 bronze badges asked Jun 23, 2016 at 4:13 this-Methis-Me 2,14577 gold badges4444 silver badges7171 bronze badges 0

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1 Answer 1

Sorted by: Reset to default 7

You can use the JavaScript Array#filter method for this, which returns an array of matches, very similar to your LINQ code:

array.filter(item => item.ID === ID)[0].name;

You could also use Array#find, but that doesn't have very good browser support, so you might need a polyfill for Opera and Internet Explorer:

array.find(item => item.ID === ID).name;

Read documentation about it: https://developer.mozilla/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

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