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Programming-Idioms

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  • Perl

Idiom #314 Fill array with value

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

my @x = (undef) x $n; 

foreach (@x) { $_ = $v }

Create a list with $n elements, each initialized to undef. Then assign $v to each element.
my @x = ($v) x $n;

This defines a new list (@x) and sets $n elements of it to $v. The list grows to length $n. The x operator in this context repeats the left operand $n times.
#include <array>
x.fill(v);
New implementation...
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programming-idioms.org 
my @x = (undef) x $n; 

foreach (@x) { $_ = $v }
my @x = ($v) x $n;
x.fill(v);
Array.Fill(x, v);
x = v
func fill[T any](x []T, v T) {
	for i := range x {
		x[i] = v
	}
}
for i := range x {
	x[i] = v
}
fill(x, v);
for i := Low(x) to High(x) do x[i] := v;
set_all_elements_to_same_value(X, V) :-
    length(X, Length),
    length(FilledList, Length),
    maplist(=(V), FilledList, X).
x[:] = [v] * len(x)
x.fill(v)
x.fill(v);