October 2024
Intermediate to advanced
272 pages
6h 54m
English
Content preview from Seven Obscure Languages in Seven Weeks
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Executing Scalar Operations
All APL executable units are called functions, even if they’re known as operators in other languages (for example, + and *). Many functions have a unary (monadic, only with the right argument) and a binary (dyadic, with both arguments) form. Function calls can also be nullary (niladic, no arguments). All functions are right-associative—executed from right to left, and this is another catch. What do you think is the result of 10-5-3-1? No, it’s not 1.
| | 10-5-3-1 ⍝ 10-(5-(3-1)) |
| | 7 |
If you don’t like the default evaluation order, use parentheses.
| | ((10-5)-3)-1 |
| | 1 |
The right associativity rule may cause unpleasant surprises that are hard to detect and defuse (here and later, the symbol ⇨ is not a part of APL ...
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