RxSwift: From operator

• Only takes an array of elements.
• Creates an observable of individual type instances from a regular array of elements.
• The produced type is an Observable of the supplied type NOT an array of the supplied type.

let lotteryNumberOne = 1
let lotteryNumberTwo = 2
let lotteryNumberThree = 3

let observable = Observable.from([lotteryNumberOne, lotteryNumberTwo, lotteryNumberThree])
// Observable of Int

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