typescript - What does '(text: string): Observable<Response>=>{}' mean -


i saw syntax didn't make sense.

public request= (text: string): observable<response> => {     const url = `https://my.api.com/search?q=${text}`;     return this.http         .get(url)         .map(data => data.json()); };

request name of function,

{} actual function, is:

(text: string): observable<response>

it supposed type of function right?

what return type of function?

more 

function(text: string): observable<response> { }

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