StringExtensions.swift

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

import Foundation

extension String {
    public func startsWith(other: String) -> Bool {
        // rangeOfString returns nil if other is empty, destroying the analogy with (ordered) sets.
        if other.isEmpty {
            return true
        }

        if let range = self.range(of: other, options: .anchored) {
            return range.lowerBound == self.startIndex
        }

        return false
    }
}