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Learn Red ? Fundamentals of Red
book

Learn Red ? Fundamentals of Red

by Ivo Balbaert
May 2018
Beginner content levelBeginner
252 pages
6h 19m
English
Packt Publishing
Content preview from Learn Red ? Fundamentals of Red

Working with numbers

The operations on numbers (+, -, *, /) can take two forms:

  • The infix notation: n * m
  • A more functional word notation, first the function, then the arguments: multiply n m

You can calculate the remainder of a division with % or // (remainder or modulo). Common logarithmic and trigonometric functions are available, together with functions to calculate the maximum and minimum of two numbers (max and min). Logical functions such as even?, positive?, or zero? test common conditions in calculations, and a versatile round function is available:

round 2.35        ;== 2.0round 2.5         ;== 3.0round/to pi 0.001 ;== 3.142 ; rounds to 0.001

Here we see a first example, /to, of a so-called refinement. It is a kind of flag that is appended to ...

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Publisher Resources

ISBN: 9781789130706Supplemental Content