Get first two digits of a string, support for negative 'numbers'

I have the following strings in JavaScript as examples: -77.230202 39.90234 -1.2352 I want to ge the first two digits, before the decimal. While maintaining the negative value. So the first one would be '-77' and the last would be '-1' Any help would be awesome! Thank you.
Not very well defined: What does -777 do? return -770 because there is only a 2 digit accuracy, or -777?

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