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v/vlib/builtin/gated_array_string_test.v

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fn test_gated_arrays() {
a := [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
assert a#[-1..] == [9]
assert a#[..-9] == [0]
assert a#[-9..-7] == [1, 2]
assert a#[-2..] == [8, 9]
// fixed array
a1 := [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]!
assert a1#[-1..] == [9]
assert a1#[..-9] == [0]
assert a1#[-9..-7] == [1, 2]
assert a1#[-2..] == [8, 9]
// empty array
assert a#[-3..-4] == [] // start > end
assert a#[20..] == [] // start > array.len
assert a#[-20..-10] == [] // start+len < 0
assert a#[20..-9] == [] // start > end && start > end
}
fn test_gated_strings() {
a := '0123456789'
assert a#[-1..] == '9'
assert a#[..-9] == '0'
assert a#[-9..-7] == '12'
assert a#[-2..] == '89'
// empty string
assert a#[-3..-4] == '' // start > end
assert a#[20..] == '' // start > array.len
assert a#[-20..-10] == '' // start+len < 0
assert a#[20..-9] == '' // start > end && start > end
//
// test negative indexes in slices from github discussion
//
s := '0123456789'
// normal behaviour
assert s#[1..3] == '12'
assert s#[..3] == '012'
assert s#[8..] == '89'
// negative indexes behaviour
assert s#[-2..] == '89'
assert s#[..-8] == '01'
assert s#[2..-2] == '234567'
assert s#[-12..-16] == ''
assert s#[-8..-2] == '234567'
// out of bound both indexes
assert s#[12..14] == ''
assert s#[-12..16] == '0123456789'
}
fn test_gated_mixed_strings() {
//
// test negative indexes in slices
//
a := [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
// normal behaviour
assert a#[1..3].str() == '[1, 2]'
assert a#[..3].str() == '[0, 1, 2]'
assert a#[8..].str() == '[8, 9]'
// negative indexes behaviour
assert a#[-2..].str() == '[8, 9]'
assert a#[..-8].str() == '[0, 1]'
assert a#[2..-2].str() == '[2, 3, 4, 5, 6, 7]'
assert a#[-12..-16].str() == '[]'
assert a#[-8..-2].str() == '[2, 3, 4, 5, 6, 7]'
// out of bound both indexes
assert a#[12..14].str() == '[]'
assert a#[-12..16].str() == a.str()
}