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Swift String subscript extension
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#https://medium.com/better-programming/24-swift-extensions-for-cleaner-code-41e250c9c4c3 | |
import Foundation | |
extension String { | |
subscript (i: Int) -> Character { | |
return self[index(startIndex, offsetBy: i)] | |
} | |
subscript (bounds: CountableRange<Int>) -> Substring { | |
let start = index(startIndex, offsetBy: bounds.lowerBound) | |
let end = index(startIndex, offsetBy: bounds.upperBound) | |
if end < start { return "" } | |
return self[start..<end] | |
} | |
subscript (bounds: CountableClosedRange<Int>) -> Substring { | |
let start = index(startIndex, offsetBy: bounds.lowerBound) | |
let end = index(startIndex, offsetBy: bounds.upperBound) | |
if end < start { return "" } | |
return self[start...end] | |
} | |
subscript (bounds: CountablePartialRangeFrom<Int>) -> Substring { | |
let start = index(startIndex, offsetBy: bounds.lowerBound) | |
let end = index(endIndex, offsetBy: -1) | |
if end < start { return "" } | |
return self[start...end] | |
} | |
subscript (bounds: PartialRangeThrough<Int>) -> Substring { | |
let end = index(startIndex, offsetBy: bounds.upperBound) | |
if end < startIndex { return "" } | |
return self[startIndex...end] | |
} | |
subscript (bounds: PartialRangeUpTo<Int>) -> Substring { | |
let end = index(startIndex, offsetBy: bounds.upperBound) | |
if end < startIndex { return "" } | |
return self[startIndex..<end] | |
} | |
} |
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Usage