StringPlus.swift

// Copyright (c) 2016 Drew Crawford.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

extension String {
    func hasSuffix(_ str: String) -> Bool {
        let view = self.utf8[self.utf8.index(self.utf8.endIndex, offsetBy: -str.utf8.count)..<self.utf8.endIndex]
        var strIndex = str.utf8.startIndex
        for char in view {
            if char != str.utf8[strIndex] { return false }
            strIndex = str.utf8.index(after: strIndex)
        }
        return true
    }
}