[ACCEPTED]-Swift 3 - Reduce a collection of objects by an Int property-reduce

Accepted answer

Score: 23

var total = arr.reduce(0, {$0 + $1.distance!})

The first argument is the accumulator, it 3 is already an integer.

Note that this will 2 crash on elements without distance. You 1 could fix that e.g. using:

let total = arr.reduce(0, {$0 + ($1.distance ?? 0)})

or

let total = arr.compactMap { $0.distance }.reduce(0, +)

Source: stackoverflow.com

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