Can people of france understand Mauritius french or hatian france?

Yes even if the accent difference is wide.
There are local expressions, but it's OK.

I have never heard Mauritius French so I couldn't tell you but the French spoken on the island of R茅union (right next to Mauritius) is perfectly understandable, yes.

However we do not understand Haitian creole. Only a few words here and there but you wouldn't understand a whole conversation. There are a lot of Haitians where I live in Boston and I hear their programs on the radio and can tell they are talking about politics for instance but I don't understand the whole sentences. As for the written form, I have seen a lot of signs written in Haitian creole here and I understand about half to 2/3 of what they say.

On these tropical francophone islands, people speak either French or creole. When they speak French they are easy to understand despite the accent and local expressions but creole is difficult to understand. In Haiti, most people speak only creole whereas on other islands they speak both.

can u understand texas ppl talk? can u understand the southern accent, NY accent, Boston accent. another words, yes they can.

I've never heard Mauritus French.

I can't understand a lick of Creole. Creole has some French words in it sure, but it is a completely different language. Creole was created by African slaves as a way to communicate in a language that the French could not understand. Theirfore, it follows that the French would be able to understand Creole because they did end up winning their war of independance!

i dont know about mauritian french, but haitian cr茅ole is not completely inteligible with french. Although 90% of the words in haitian cr茅ole are french, they are pronounced differently and the grammar is different. Depending on the level of education of the speaker, their spoken cr茅ole can be alot closer to french. Haitian French, however, is distinct from cr茅ole and is basically the same language as parisian french, with an accent.

example-
They- Eux(french) Yo(Cr茅ole)

the writing system of cr茅ole is different as well. i can understand both cr茅ole and french, but i cant read in cr茅ole at all.

nearly all haitians speak cr茅ole, but only about 20% can speak french, mostly the educated 茅lite. a somewhat larger number can understand it.