Created
July 2, 2019 06:54
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String extension to get character like array indices
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extension String { | |
var length: Int { | |
return count | |
} | |
subscript (i: Int) -> String { | |
return self[i ..< i + 1] | |
} | |
func substring(fromIndex: Int) -> String { | |
return self[min(fromIndex, length) ..< length] | |
} | |
func substring(toIndex: Int) -> String { | |
return self[0 ..< max(0, toIndex)] | |
} | |
subscript (r: Range<Int>) -> String { | |
let range = Range(uncheckedBounds: (lower: max(0, min(length, r.lowerBound)), | |
upper: min(length, max(0, r.upperBound)))) | |
let start = index(startIndex, offsetBy: range.lowerBound) | |
let end = index(start, offsetBy: range.upperBound - range.lowerBound) | |
return String(self[start ..< end]) | |
} | |
} |
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