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ConstantArray

Creates an array of repeated elements.

$ wo 'ConstantArray[x, 3]'
{x, x, x}
$ wo 'ConstantArray[0, 5]'
{0, 0, 0, 0, 0}
$ wo 'ConstantArray[1, 0]'
{}
$ wo 'ConstantArray[a, {2, 3}]'
{{a, a, a}, {a, a, a}}