Meaning of setSp and .sp

[AthreshK]

Hi ,
I was reading through the documentation and I felt it confusing to understand the difference between setSp() and .sp

I am new to using this package and I wanted to know what am I "setting" when I use the setSp(10)

Is it just a getter for the adapted font size ?

Do I need to call it everytime when want the size if I have already used the initializer and set the canvas size and given MaterialApp in builder?

Is it different than 10.sp ?

Please help me understand

Thank you

[lizhuoyuan]

10.sp = setSp(10)

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