Nick Samoylov's Blog, page 3

Java streams 29. Collect 5. Method join() and Collectors.joining() collector

Sometimes we need to create a string that contains comma-separated values emitted by a stream. The collect() operation with the Collectors.joining() collector (with a parameter that describes a delimiter) is very convenient way to do it.

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Wittgenstein 7. Tragedy

A tragedy “helps” to look deeper. It is hard, but strips from stereotypes and preconceived patterns (expectations). Maybe that’s why it was the first theatric form developed by Ancient Greeks. We all experience problems, but very few of us get them as many and as deep as Wittgenstein.

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Wittgenstein 6. Patterns

Pattern recognition and automatic decision making create a foundation for our third activity of explaining (rationalizing) our decisions and whatever we observe – all the time, never pausing. Most of this third activity is done automatically too. Yet some of it we do consciously, sometimes with great effort, trying to “understand” – to discover the […]

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Wittgenstein 5. Thinking

A human, even in doubt, finds a way to make a decision, may be based just on the liking the instructor or not. Or on using some kind of moral principles. Or just from sheer compassion. Such irrational decision making apparently was beneficial, since human species managed to survive so far. This means that our […]

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Java streams 26. Collect 2. The .maxBy() and .minBy() collectors

Collectors.maxBy() and Collectors.minBy() collectors calculate the max and the min element correspondingly according to a given Comparator

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Java streams 26. Collect 2. Counting the stream elements

This is a very straightforward operation. It counts a number of emitted elements. But it does a bit more than the Stream operator count().

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Java streams 25. Collect 1. Custom collector

The collect() operation is a specialization of reduce(). It allows implementing a vast variety of algorithms using the ready-to-use implementations of collectors located in the java.util.stream.Collectors class.

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Java streams 25. Collect 1. Custom collector and joining()

The collect() operation is a specialization of reduce(). It allows implementing a vast variety of algorithms using the ready-to-use implementations of collectors located in the java.util.stream.Collectors class.

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Wittgenstein 4. Language

The change of the view on the language – from modeling structure to reflecting usage – was the primary motivation for Wittgenstein to write his second book Philosophical Investigations, where he introduced the notion of “language games”. He now states that the meaning of a word or even a sentence comes from the context of […]

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Wittgenstein 3. Implementation

Abraham Kaplan made an observation in his book The Conduct of Inquiry (1964): “In addition to the social pressures from the scientific community there is also at work a very human trait of individual scientist. I call it the law of the instrument, and it may be formulated as follows: Give a small boy a […]

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