Swift sort array of objects based on boolean value

Swift’s arrays can be sorted in place with sort or to a new array with sorted. The single parameter of either function is a closure taking two elements and returning true if and only if the first is ordered before the second. The shortest way to use the closure’s parameters is by referring to them as $0 and $1.

For example (to sort the true booleans first):

// In-place:
array.sort { $0.selected && !$1.selected }

// To a new array:
array.sorted { $0.selected && !$1.selected }

(edit: Updated for Swift 3, 4 and 5, previously sort was sortInPlace and sorted was sort.)