Generator/Exponential: Difference between revisions
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Lingo neither supports coroutines nor first-class functions, and also misses syntactic sugar for implementing real generators. But in the context of traditional for-loops, a peculiarity of Lingo can be used to implement generator-like behavior: in Lingo, the halting condition (b) in a "repeat with i = a to b" loop is not pre-cached, but evaluated in each single step. This behavior can be used - in combination with simple pseudo-generator objects that store states internally - to implement generator like behavior in loops, and solve the given task. |
Lingo neither supports coroutines nor first-class functions, and also misses syntactic sugar for implementing real generators. But in the context of traditional for-loops, a peculiarity of Lingo can be used to implement generator-like behavior: in Lingo, the halting condition (b) in a "repeat with i = a to b" loop is not pre-cached, but evaluated in each single step. This behavior can be used - in combination with simple pseudo-generator objects that store states internally - to implement generator like behavior in loops, and solve the given task. |
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<lang Lingo> |
<lang Lingo>squares = script("generator.power").new(2) |
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squares = script("generator.power").new(2) |
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cubes = script("generator.power").new(3) |
cubes = script("generator.power").new(3) |
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filter = script("generator.filter").new(squares, cubes) |
filter = script("generator.filter").new(squares, cubes) |
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if i>30 then exit repeat |
if i>30 then exit repeat |
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if i>20 then put res[1] |
if i>20 then put res[1] |
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end repeat |
end repeat</lang> |
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</lang> |
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{{out}} |
{{out}} |
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-- @constructor |
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-- |
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on new (me, e) |
on new (me, e) |
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