Sha256: 20fb38f152de5347dc24efb5495ead719209bd4be7a8b78fc7f4454892258844
Contents?: true
Size: 1 KB
Versions: 9
Compression:
Stored size: 1 KB
Contents
class Array
# Return random number indexes of an Array. If the _number_
# of elements is set to <tt>nil</tt>, the default, then
# returns a random number of indicies up to the size of the
# array.
#
# When _exclusive_ is <tt>true</tt> (the default) and the
# _number_ given is greater than the size of the array,
# then all indexes are returned.
#
# ["a", "b", "c", "d"].rand_indexes #=> [1]
# ["a", "b", "c", "d"].rand_indexes #=> [2,4]
# ["a", "b", "c", "d"].rand_indexes(2) #=> [2,1]
# ["a", "b", "c", "d"].rand_indexes(3) #=> [1,3,2]
# ["a", "b", "c", "d"].rand_indexes(3,false) #=> [4,3,4]
#
def rand_indexes( number=nil, exclusive=true )
n = rand( size ) unless number
n = number.to_int
if exclusive
idx = (0...size).to_a
return idx if number >= size
return idx.sort_by{rand}.slice(0,n)
else
a = []
n.times{ a << rand(size) }
a
end
end
alias_method :rand_indicies, :rand_indexes
end
Version data entries
9 entries across 9 versions & 1 rubygems