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Check whether all items in an array match a condition

Swift version: 5.1

Paul Hudson    @twostraws   

Swift has built-in way of checking whether all items in an array match a condition: the allSatisfy() method. Give this thing a condition to check, and it will apply that condition on all items until it finds one that fails, at which point it will return false. If it reaches the end of the array and all have passed the condition, it will return true.

For example, you can check whether all items in an array of numbers are under 10:

[1, 2, 3, 4, 5].allSatisfy { $0 < 10 }

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Available from iOS 8.0

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