How do libraries let you write programs at a higher level? Why is testing important when building and sharing libraries?

What are the three uses of a screw?

If i wanted to include a built-in calendar in a document, what option could i select? draw table insert table insert chart quick tables

The camera still is bad even with the new iphone xr and especially in low light it is even worst because you can see the pixels more if its in low light. if all you apple customers want apple to fix this then lets fill there feedback with complaints about the can apple do to fix this issue?