struct Foo {
    bar int
mut:
    str string
}

fn main() {
    {
        // test add
        mut a := 'a'
        a += 'b'
        println(a)
        a = 'a'
        for i := 1; i < 1000; i++ {
            a += 'b'
        }
        println(a.len)
        println(a.ends_with('bbbbb'))
        a += '123'
        println(a.ends_with('3'))
    }
    {
        // test ends with
        a := 'browser.v'
        println(a.ends_with('.v'))

        s := 'V Programming Language'
        assert s.ends_with('guage') == true
        assert s.ends_with('Language') == true
        assert s.ends_with('Programming Language') == true
        assert s.ends_with('V') == false
    }
    {
        // test between
        s := 'hello [man] how you doing'
        println(s.find_between('[', ']'))
    }
    {
        // test compare
        a := 'Music'
        b := 'src'
        println(b >= a)
    }
    {
        // test lt
        a := ''
        b := 'a'
        c := 'a'
        d := 'b'
        e := 'aa'
        f := 'ab'

        assert a < b
        assert !(b < c)
        assert c < d
        assert !(d < e)
        assert c < e
        assert e < f
    }
    {
        // test ge
        a := 'aa'
        b := 'aa'
        c := 'ab'
        d := 'abc'
        e := 'aaa'
        assert b >= a
        assert c >= b
        assert d >= c
        assert !(c >= d)
        assert e >= a
    }
    {
        // test compare strings
        a := 'aa'
        b := 'aa'
        c := 'ab'
        d := 'abc'
        e := 'aaa'
        assert compare_strings(a, b) == 0
        assert compare_strings(b, c) == -1
        assert compare_strings(c, d) == -1
        assert compare_strings(d, e) == 1
        assert compare_strings(a, e) == -1
        assert compare_strings(e, a) == 1
    }
    {
        // test sort
        mut vals := [
            'arr',
            'an',
            'a',
            'any',
        ]
        len := vals.len
        vals.sort()
        assert len == vals.len
        assert vals[0] == 'a'
        assert vals[1] == 'an'
        assert vals[2] == 'any'
        assert vals[3] == 'arr'
    }
    {
        // todo(playX): sort codegen
        /*// test sort reverse
        mut vals := [
            'arr',
            'an',
            'a',
            'any',
        ]
        len := vals.len
        vals.sort(b > a)
        assert len == vals.len
        assert vals[0] == 'a'
        assert vals[1] == 'an'
        assert vals[2] == 'any'
        assert vals[3] == 'arr'*/
    }
    {
        // todo: split nth
        /*
        a := '1,2,3'
        assert a.split(',').len == 3
        assert a.split_nth(',', -1).len == 3
        assert a.split_nth(',', 0).len == 3
        assert a.split_nth(',', 1).len == 1
        assert a.split_nth(',', 2).len == 2
        assert a.split_nth(',', 10).len == 3
        b := '1::2::3'
        assert b.split('::').len == 3
        assert b.split_nth('::', -1).len == 3
        assert b.split_nth('::', 0).len == 3
        assert b.split_nth('::', 1).len == 1
        assert b.split_nth('::', 2).len == 2
        assert b.split_nth('::', 10).len == 3
        c := 'ABCDEF'
        println(c.split('').len)
        assert c.split('').len == 6
        assert c.split_nth('', 3).len == 3
        assert c.split_nth('BC', -1).len == 2
        d := ','
        assert d.split(',').len == 2
        assert d.split_nth('', 3).len == 1
        assert d.split_nth(',', -1).len == 2
        assert d.split_nth(',', 3).len == 2
        e := ',,,0,,,,,a,,b,'
        assert e.split(',,').len == 5
        assert e.split_nth(',,', 3).len == 3
        assert e.split_nth(',', -1).len == 12
        assert e.split_nth(',', 3).len == 3
        */
    }
    {
        // test split
        mut s := 'volt/twitch.v:34'
        mut vals := s.split(':')
        assert vals.len == 2
        assert vals[0] == 'volt/twitch.v'
        assert vals[1] == '34'
        // /////////
        s = '2018-01-01z13:01:02'
        vals = s.split('z')
        assert vals.len == 2
        assert vals[0] == '2018-01-01'
        assert vals[1] == '13:01:02'
        // //////////
        s = '4627a862c3dec29fb3182a06b8965e0025759e18___1530207969___blue'
        vals = s.split('___')
        assert vals.len == 3
        assert vals[0] == '4627a862c3dec29fb3182a06b8965e0025759e18'
        assert vals[1] == '1530207969'
        assert vals[2] == 'blue'
        // /////////
        s = 'lalala'
        vals = s.split('a')
        assert vals.len == 4
        assert vals[0] == 'l'
        assert vals[1] == 'l'
        assert vals[2] == 'l'
        assert vals[3] == ''
        // /////////
        s = 'awesome'
        a := s.split('')
        assert a.len == 7
        assert a[0] == 'a'
        assert a[1] == 'w'
        assert a[2] == 'e'
        assert a[3] == 's'
        assert a[4] == 'o'
        assert a[5] == 'm'
        assert a[6] == 'e'
        // /////////
        s = 'wavy turquoise bags'
        vals = s.split(' bags')
        assert vals.len == 2
        assert vals[0] == 'wavy turquoise'
        assert vals[1] == ''
    }
}