Set all the elements in the array x to the same value v
New implementation

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Other implementations
x = v
for i := range x {
	x[i] = v
func fill[T any](x []T, v T) {
	for i := range x {
		x[i] = v
for i := Low(x) to High(x) do x[i] := v;
my @x = ($v) x $n;
my @x = (undef) x $n; 

foreach (@x) { $_ = $v }
set_all_elements_to_same_value(X, V) :-
    length(X, Length),
    length(FilledList, Length),
    maplist(=(V), FilledList, X).
x[:] = [v] * len(x)