GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
gap> START_TEST("startendwith.tst"); gap> StartsWith("abc", "a"); true gap> StartsWith("abc", "abc"); true gap> StartsWith("", ""); true gap> StartsWith("abc", "abcd"); false gap> StartsWith("", "abc"); false gap> StartsWith("abc", "ab"); true gap> StartsWith("abc", ""); true gap> StartsWith([1,2,3], [1,2]); true gap> StartsWith([1,2], [1,2,3]); false gap> StartsWith("abc", ['a', 'b']); true gap> StartsWith("abc", "bc"); false gap> EndsWith("abc", "c"); true gap> EndsWith("abc", "abc"); true gap> EndsWith("", ""); true gap> EndsWith("abc", "abcd"); false gap> EndsWith("", "abc"); false gap> EndsWith("abc", "bc"); true gap> EndsWith("abc", ""); true gap> EndsWith([1,2,3], [2,3]); true gap> EndsWith([1,2], [1,2,3]); false gap> EndsWith("abc", ['b', 'c']); true gap> STOP_TEST("startendwith.tst", 250000);