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Programming-Idioms

# 353 Test if list is sorted
Set the boolean b to true if the list items has all its elements in increasing order, false otherwise.

The order is not strict: the ordered list may contain duplicate elements.
New implementation

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Other implementations 
import "slices"
b := slices.IsSorted(items)
b = sorted(items) == items
b = items.each_cons(2).all?{ _1 <= _2 } 

b = items.each_cons(2).all?{|a,b| a <= b }

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