Double is a data type that represents a double-precision 64-bit floating point number, providing a wider range of values than the float data type. It's commonly used when you need more precision than a float can offer, like when calculating the national debt or the number of ads served by a certain social media company.

How to use it in a sentence

• "I tried using a float for my startup's revenue projections, but quickly switched to a double when I realized we might actually make some real money."

• "When calculating the trajectory of Elon's latest rocket, be sure to use a double - we wouldn't want it to end up in the wrong solar system due to rounding errors."

If you actually want to learn more...

• Martin Fowler dives deeper into the various types of Test Doubles, including dummies, fakes, stubs, spies, and mocks, in his article Test Double.

• For more on handling non-determinism in tests, especially when dealing with remote services, check out Fowler's piece on Eradicating Non-Determinism in Tests.

• Paul Graham provides a comprehensive list of Lisp Resources for those looking to explore the language often associated with AI and, apparently, rockets needing high-precision doubles.

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