Doubts about a typescript syntax found within the documentation [duplicate]

Question

I am in reference to the typescript documentation about advanced types. See here.

The following example is given:

interface Map<T> {
   [key: string]: T;
}

I understand the Map's type variable T.

My doubt is rather about the syntax within the interface declaration i.e. this exact line:

[key: string]: T;

Can someone please translate in english what the above line means?
And refer me to relevant documentation about the square brackets syntax for the key?

I think I have found the answer to my question. See here: stackoverflow.com/a/37899294/536299 — balteo
– balteo, Commented Nov 25, 2017 at 18:49
Thanks to David Sherret for his reply to the other question. — balteo
– balteo, Commented Nov 25, 2017 at 18:58

balteo · Accepted Answer · 2017-11-25 18:52:28Z

1

I have found the answer to my question. It is a Typescript Index Signature.

answered Nov 25, 2017 at 18:52

balteo

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