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interface History {
fun push(url: URL)
fun pop(): URL
fun peek(): URL
}
class Browser(
private val history: History
) {
var activeURL: URL? = null
private set
fun visit(url: URL) {
activeURL = if (url == URL("http://default"))
history.peek() else
url
history.push(activeURL!!)
}
fun back() {
history.pop()
activeURL = history.peek()
}
}
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