Meaning of ってのは in Japanese

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Definition of ってのは

ってのは(ttenoha)

入学にゅうがくしてする１か月・・・まだ一人も友達ともだちがいないいるってのはやばすぎる。このままじゃ中学ちゅうがくの二の舞にのまいだ！！

One month since entering high school ... not a single friend yet. That's really terrible, at this rate it will be middle-school all over again!!

Well that's because in fiction that sort of fine detail gets skipped.

今週末こんしゅうまつ、山やまに行くってのはどうかな？

Why don't we go to the mountains this weekend?

Rather than cutting down on cigarettes, sir, why don't you just give them up?