Array Slices

Array Slices

• A range can be used in place of an array index to specify a portion of an array


• The portion of the array is called an array slice

Array Slices - Compare These Two Statements

• Example:

    declare
        s: String := "Hi Mom!";
    begin
        put_line(s(4..7) & s(1..2));
    

• What output does this produce?


• Is this what we want?


• If not, how to fix?

Array Slices - Compare These Two Statements

• Example:

    declare
        s: String := "Hi Mom!";
    begin
        put_line(s(4..7) & s(3..3) & s(1..2));

        put_line(s(4..7) & s(3) & s(1..2));
    

• What would s(4..3) represent
• How else could this be written?

Array Slice - Example

• Slices can be used in assignments


• Slice bounds can be dynammic


• Example: slicedemo.adb and prettified

Array Slices and Unconstrained Arrays

• We can gain flexibility by passing a slice to a parameter that's an unconstrained array



• Example: slicedemo2.adb and prettified