31 lines
795 B
Text
31 lines
795 B
Text
This implements some words to return a range of numbers on the stack.
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It's probably best to capture these values in an array.
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First is a word to return values from a lower to upper limit, incrementing
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upwards. The returned values are inclusive of the limits.
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~~~
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:range<inc> (lh-a)
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over - n:inc [ I over + swap ] times<with-index> drop ;
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~~~
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Next is a word to return values from an upper to lower limit, decrementing
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upwards. The returned values are inclusive of the limits.
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~~~
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:range<dec> (hl-a)
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over &- dip swap n:inc [ I over swap - swap ] times<with-index> drop ;
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~~~
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The last word takes the limits and calls the appropriate word.
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~~~
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:range (nn-a)
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dup-pair gt? [ range<dec> ] [ range<inc> ] choose ;
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~~~
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As a simple test case:
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```
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{ #1 #5 range } [ n:put sp ] a:for-each
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```
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