Why processing a sorted array is faster than an processing an unsorted array

Previous submissions:<p><a href="https://news.ycombinator.com/item?id=4637196" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=4637196</a><p><a href="https://news.ycombinator.com/item?id=5960299" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=5960299</a>