TypeScript Looping through a dictionary

Question

In my code  I have a couple of dictionaries  as suggested here  which is String indexed  Due to this being a bit of an improvised type  I was wondering if there any suggestions on how I would be able to loop through each key  or value  all I need the keys for anyway   Any help appreciated   myDictionary     index  string   any

User · Answer

How about this   for  let  key  value  of Object entries obj

User · Answer

To get the keys   function GetDictionaryKeysAsArray dict    key  string   string     string       let result  string           Object keys dict  map  key    gt      result push key          return result

User · Answer

To loop over the key values  use a for in loop   for  let key in myDictionary        let value   myDictionary key          Use  key  and  value

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lt  ES 2017  Object keys obj  forEach key   gt      let value   obj key         gt   ES 2017  Object entries obj  forEach      key  value     gt  console log key  value

User · Answer

There is one caveat to the key value loop that Ian mentioned  If it is possible that the Objects may have attributes attached to their Prototype  and when you use the in operator  these attributes will be included  So you will want to make sure that the key is an attribute of your instance  and not of the prototype  Older IEs are known for having indexof v  show up as a key   for  const key in myDictionary        if  myDictionary hasOwnProperty key             let value   myDictionary key

User · Answer

Ians Answer is good  but you should use const instead of let for the key because it never gets updated   for  const key in myDictionary        let value   myDictionary key          Use  key  and  value

User · Answer

If you just for in a object without if statement hasOwnProperty then you will get error from linter like  for  const key in myobj       console log key      WARNING in component ts for      in      statements must be filtered with an if statement  So the solutions is use Object keys and of instead  for  const key of Object keys myobj        console log key       Hope this helper some one using a linter

User · Answer

Shortest way to get all dictionary object values   Object keys dict  map k   gt  dict k

[javascript] TypeScript, Looping through a dictionary

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