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take
Combined from primary sources listed below.

In Mu§

See primary documentation in context for method take 

method take()

Returns the invocant in the enclosing gather block.

sub insert($sep, +@list) {
    gather for @list {
        FIRST .take, next;
        take slip $sep, .item
    }
}

say insert ':', <a b c>;
# OUTPUT: «(a : b : c)␤»

In Mu§

See primary documentation in context for routine take 

sub take(\item)

Takes the given item and passes it to the enclosing gather block.

#| randomly select numbers for lotto
my $num-selected-numbers = 6;
my $max-lotto-numbers = 49;
gather for ^$num-selected-numbers {
    take (1 .. $max-lotto-numbers).pick(1);
}.say;    # six random values