24 lines
611 B
Swift
24 lines
611 B
Swift
import Foundation
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public extension String {
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func index(from: Int) -> Index {
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return self.index(startIndex, offsetBy: from)
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}
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func substring(from: Int) -> String {
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let fromIndex = index(from: from)
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return String(self[fromIndex...])
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}
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func substring(to: Int) -> String {
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let toIndex = index(from: to)
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return String(self[..<toIndex])
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}
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func substring(with r: Range<Int>) -> String {
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let startIndex = index(from: r.lowerBound)
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let endIndex = index(from: r.upperBound)
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return String(self[startIndex..<endIndex])
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}
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}
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