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Programming-Idioms

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Idiom #339 Clear a byte array

Set all the elements of the byte array a to zero

clear(a[:])

a is an array (but slices are more common)
clear(a)

a is a slice
Array.Fill(a, (byte)0);
New implementation...
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programming-idioms.org 
clear(a[:])
clear(a)
Array.Fill(a, (byte)0);
Arrays.fill(a, (byte)0);
FillByte(a, Length(a), 0);
a = numpy.ones((n,), numpy.uint8)
a.fill(0)
a.fill(0);