Substring inserting in Swift
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var dataString = "string"
var index = dataString.startIndex
dataString.insertContentsOf("Sub".characters, at: index)
//dataString is "Substring"
index = dataString.startIndex.advancedBy(9)
dataString.insert("!", atIndex: index)
//dataString is "Substring!"
dataString.insertContentsOf(" inserting".characters, at: index)
//dataString is "Substring inserting!"
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