saving multiple string labels and array to associated array in typescript

Question

I am building an ionic 4 app which has to save multiple labels and arrays to an associative array but having trouble with initializing and pushing new items to the array and editing/updating existing array items in the associative array.

  array1 = {
           'Question1'=>['True','True'],
           'Question2'=>['False, False'] 
           }

How can I do this in typescript?

You might be comming from PHP where this is possible, but JS (and TS) does not support string keys for arrays. You can use objects or a maps (where strings can be keys). obj: { [key: string]: string[] } = { key1: ["1a", "1b"] } or see stackoverflow.com/questions/30019542/es6-map-in-typescript — Klímačka
– Klímačka, Commented Oct 9, 2020 at 6:49
Thanks @Klímačka. Yeah i came from a PHP background I thought it would be possible since I am new to typescript. Let me look into mapping in typescript — appdevnoobie
– appdevnoobie, Commented Oct 9, 2020 at 8:47

eol · Accepted Answer · 2020-10-09 06:41:38Z

1

JavaScript/TypeScript does not support arrays with named indexes, arrays always use numbered indexes. You can, however, use a simple object to do this, e.g.:

    const questions = {
        "question1": [true, true],
        "question2": [false, false]
    }
    
    console.log(questions);
    console.log(questions["question1"]) // prints [true, true]

answered Oct 9, 2020 at 6:41

eol

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2 Comments

appdevnoobie Over a year ago

Thanks @eol, I will look into numbered indexes. I was also advised to look into mapping in typescript

eol Over a year ago

@appdevnoobie: Happy to help, don't forget to accept this answer (by clicking the checkmark to the left) if this solved your problem.

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