看起来maxpairs
不喜欢在具有未定义值的列表上调用:
> my @foo; @foo[2] = 4; say @foo.maxpairs;
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
in block <unit> at <unknown file> line 1
(2 => 4)
max
没有同样的问题,似乎只是忽略了未定义的值:
> my @foo; @foo[2] = 4; say @foo.max;
4
同样的错误确实发生在:
> my @foo; @foo[2] = 4; say @foo.pairs.max(*.value)
Use of uninitialized value of type Any in string context.
Methods .^name, .perl, .gist, or .say can be used to stringify it to something meaningful.
in block <unit> at <unknown file> line 1
2 => 4
因此,似乎只有在max
没有过滤器参数的情况下才忽略未定义的值。
这是一个错误吗?