What does the offset word mean in the context of programming?

Question

Hello

What does the offset word mean in the context of programming? does mean in the beginning or by a distance.

what does string.offsetByCodePoints(int index, int codePointOffset) method exactly do?

And what do they mean in the documentation by Unpaired surrogates?

Thanks in advance for your help

Answer 1

According to the JavaDoc,

String.offsetByCodePoints(int index, int codePointOffset)

Returns the index within this object that is offset from {@code index} by {@code codePointOffset} code points.

Here is an example of usage...

int num = 0;
num = "Test_String".offsetByCodePoints(0, 2); //num is 2
num = "Test_String".offsetByCodePoints(3, 2); //num is 5
num = "Test_String".offsetByCodePoints(9, 5); //Throws an exception since offset goes out-of-bounds