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v/vlib/arrays/arrays_test.v

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module arrays
fn test_min() ? {
a := [8, 2, 6, 4]
mut ri := min(a) ?
assert ri == 2
ri = min(a[2..]) ?
assert ri == 4
b := [f32(5.1), 3.1, 1.1, 9.1]
mut rf := min(b) ?
assert rf == f32(1.1)
rf = min(b[..2]) ?
assert rf == f32(3.1)
c := [byte(4), 9, 3, 1]
mut rb := min(c) ?
assert rb == byte(1)
rb = min(c[..3]) ?
assert rb == byte(3)
}
fn test_max() ? {
a := [8, 2, 6, 4]
mut ri := max(a) ?
assert ri == 8
ri = max(a[1..]) ?
assert ri == 6
b := [f32(5.1), 3.1, 1.1, 9.1]
mut rf := max(b) ?
assert rf == f32(9.1)
rf = max(b[..3]) ?
assert rf == f32(5.1)
c := [byte(4), 9, 3, 1]
mut rb := max(c) ?
assert rb == byte(9)
rb = max(c[2..]) ?
assert rb == byte(3)
}
fn test_idx_min() ? {
a := [8, 2, 6, 4]
ri := idx_min(a) ?
assert ri == 1
b := [f32(5.1), 3.1, 1.1, 9.1]
rf := idx_min(b) ?
assert rf == 2
c := [byte(4), 9, 3, 1]
rb := idx_min(c) ?
assert rb == 3
}
fn test_idx_max() ? {
a := [8, 2, 6, 4]
ri := idx_max(a) ?
assert ri == 0
b := [f32(5.1), 3.1, 1.1, 9.1]
rf := idx_max(b) ?
assert rf == 3
c := [byte(4), 9, 3, 1]
rb := idx_max(c) ?
assert rb == 1
}
fn test_merge() {
a := [1, 3, 5, 5, 7]
b := [2, 4, 4, 5, 6, 8]
c := []int{}
d := []int{}
assert merge<int>(a, b) == [1, 2, 3, 4, 4, 5, 5, 5, 6, 7, 8]
assert merge<int>(c, d) == []
assert merge<int>(a, c) == a
assert merge<int>(d, b) == b
}
fn test_fixed_array_assignment() {
mut a := [2]int{}
a[0] = 111
a[1] = 222
b := a
assert b[0] == a[0]
assert b[1] == a[1]
mut c := [2]int{}
c = a
assert c[0] == a[0]
assert c[1] == a[1]
d := [3]int{init: 333}
for val in d {
assert val == 333
}
e := [3]string{init: 'vlang'}
for val in e {
assert val == 'vlang'
}
}
fn test_group() {
x := [4, 5, 6]
y := [2, 1, 3]
z := group<int>(x, y)
assert z == [[4, 2], [5, 1], [6, 3]]
x2 := [8, 9]
z2 := group<int>(x2, y)
assert z2 == [[8, 2], [9, 1]]
assert group<int>(x, []int{}) == [][]int{}
}
fn test_chunk() {
x := [1, 2, 3, 4, 5]
y := ['a', 'b', 'c', 'd', 'e', 'f']
z1 := chunk<int>(x, 2)
assert z1 == [[1, 2], [3, 4], [5]]
z2 := chunk<string>(y, 3)
assert z2 == [['a', 'b', 'c'], ['d', 'e', 'f']]
assert chunk<int>([]int{}, 2) == [][]int{}
}
fn test_window() {
x := [1, 2, 3, 4, 5, 6]
assert window<int>(x, size: 3) == [[1, 2, 3], [2, 3, 4], [3, 4, 5],
[4, 5, 6]]
assert window<int>(x, size: 3, step: 2) == [[1, 2, 3], [3, 4, 5]]
assert window<int>([]int{}, size: 2) == [][]int{}
}
fn test_sum() {
x := [1, 2, 3, 4, 5]
assert sum<int>(x) or { 0 } == 15
assert sum<f64>([1.0, 2.5, 3.5, 4.0]) or { 0 } == 11.0
assert sum<int>([]int{}) or { 0 } == 0
}
fn test_reduce() {
x := [1, 2, 3, 4, 5]
assert reduce<int>(x, fn (t1 int, t2 int) int {
return t1 + t2
}) or { 0 } == 15
assert reduce<string>(['H', 'e', 'l', 'l', 'o'], fn (t1 string, t2 string) string {
return t1 + t2
}) or { '' } == 'Hello' // For the sake please use array's join instead.
assert reduce<int>([]int{}, fn (t1 int, t2 int) int {
return 0
}) or { -1 } == -1
}
fn test_fold() {
x := [1, 2, 3, 4, 5]
assert fold<int, int>(x, 5, fn (r int, t int) int {
return r + t
}) == 20
assert fold<string, int>(['H', 'e', 'l', 'l', 'l'], 0, fn (r int, t string) int {
return r + t[0]
}) == 497
assert fold<int, int>([]int{}, -1, fn (t1 int, t2 int) int {
return 0
}) == -1
}
fn test_flatten() {
x := [[1, 2, 3], [4, 5, 6]]
assert flatten<int>(x) == [1, 2, 3, 4, 5, 6]
assert flatten<int>([[]int{}]) == []
}
fn test_group_by() {
x := ['H', 'el', 'l', 'o ']
assert group_by<int, string>(x, fn (v string) int {
return v.len
}) == {
1: ['H', 'l']
2: ['el', 'o ']
}
assert group_by<int, int>([]int{}, fn (v int) int {
return 0
}) == map[int][]int{}
}
fn test_concat_int() {
mut a := [1, 2, 3]
mut b := [3, 2, 1]
assert concat(a, ...b) == [1, 2, 3, 3, 2, 1]
}
fn test_concat_string() {
mut a := ['1', '2', '3']
mut b := ['3', '2', '1']
assert concat(a, ...b) == ['1', '2', '3', '3', '2', '1']
}
fn test_binary_search() ? {
a := [1, 3, 3, 4, 5, 6, 7, 8, 10]
assert binary_search(a, 3) ? == 1
assert (binary_search(a, 0) or { -1 }) == -1
}
fn test_lower_bound() ? {
a := [1, 3, 3, 4, 5, 6, 7, 8, 10]
b := []int{}
c := [1, 2, 3]
assert lower_bound(a, 2) ? == 3
assert (lower_bound(b, 4) or { -1 }) == -1
assert lower_bound(c, 3) ? == 3
}
fn test_upper_bound() ? {
a := [1, 3, 3, 4, 5, 6, 7, 8, 10]
b := []int{}
c := [1, 2, 3]
assert upper_bound(a, 9) ? == 8
assert (upper_bound(b, 4) or { -1 }) == -1
assert upper_bound(c, 2) ? == 2
}
fn test_rotate_right() {
mut x := [1, 2, 3, 4, 5, 6]
rotate_right(mut x, 2)
assert x == [5, 6, 1, 2, 3, 4]
}
fn test_rotate_left() {
mut x := [1, 2, 3, 4, 5, 6]
rotate_left(mut x, 2)
assert x == [3, 4, 5, 6, 1, 2]
}
struct Abc {
x u64 = 1
y u64 = 2
z u64 = 3
}
fn test_rotate_right_struct() {
mut x := [Abc{1, 0, 1}, Abc{2, 0, 1}, Abc{3, 0, 1}, Abc{4, 0, 1},
Abc{5, 0, 1}, Abc{6, 0, 1}]
rotate_right(mut x, 2)
assert x == [Abc{5, 0, 1}, Abc{6, 0, 1}, Abc{1, 0, 1}, Abc{2, 0, 1},
Abc{3, 0, 1}, Abc{4, 0, 1}]
}
fn test_rotate_left_struct() {
mut x := [Abc{1, 0, 1}, Abc{2, 0, 1}, Abc{3, 0, 1}, Abc{4, 0, 1},
Abc{5, 0, 1}, Abc{6, 0, 1}]
rotate_left(mut x, 2)
assert x == [Abc{3, 0, 1}, Abc{4, 0, 1}, Abc{5, 0, 1}, Abc{6, 0, 1},
Abc{1, 0, 1}, Abc{2, 0, 1}]
}
fn test_rotate_right_string() {
mut x := ['x1', 'x2', 'x3', 'x4', 'x5', 'x6']
rotate_right(mut x, 2)
assert x == ['x5', 'x6', 'x1', 'x2', 'x3', 'x4']
}
fn test_rotate_left_string() {
mut x := ['x1', 'x2', 'x3', 'x4', 'x5', 'x6']
rotate_left(mut x, 2)
assert x == ['x3', 'x4', 'x5', 'x6', 'x1', 'x2']
}
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fn test_copy() {
mut a := [1, 2, 3]
mut b := [4, 5, 6]
assert copy(mut b, a) == 3
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assert b == [1, 2, 3]
// check independent copies
b[0] = 99
assert a[0] == 1
// check longer src
b << 7
assert copy(mut a, b) == 3
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assert a == [99, 2, 3]
// check longer dst
assert copy(mut b, [8, 9]) == 2
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assert b == [8, 9, 3, 7]
}
fn test_can_copy_bits() {
assert can_copy_bits<byte>()
assert can_copy_bits<int>()
assert can_copy_bits<voidptr>()
assert can_copy_bits<&byte>()
// autofree needs to intercept assign
assert !can_copy_bits<string>()
assert !can_copy_bits<[]int>()
// map not copyable
assert !can_copy_bits<map[string]int>()
}
type Str = string
fn test_alias_string_contains() {
names := [Str('')]
assert (Str('') in names) == true
}
struct XYZ {}
fn test_array_append_empty_struct() {
mut names := []XYZ{cap: 2}
names << XYZ{}
assert (XYZ{} in names) == true
// test fixed array
array := [XYZ{}]
assert (XYZ{} in names) == true
}