fix: string

examples/string/lib/moon.pkg.json

@@ -1,3 +1 @@
-{
-  "name": "lib"
-}
+{}

examples/string/lib/string.mbt

@@ -1,38 +1,27 @@
-pub fn split(s : String, sep : Char) -> (Array[String], Int) {
+pub fn split(s : String, sep : Char) -> @vec.Vec[String] {
   let mut index = 0
-  let mut result : Array[String] = Array::make(5, "")
-  let mut cur = 0
+  let result = @vec.Vec::new()
   let it = iter(s)
   while it.index != it.length {
     let c = match it.next() {
       Some(c) => c
-      None => {return (result, cur)}
+      None => return result
     }
     if c == sep {
       let sub = match sub_string(s, index, it.index - 1) {
         Some(sub) => sub
-        None => {return (result, cur)}
-      }
-      result.set(cur, sub)
-      cur = cur + 1
-      if cur >= result.length() {
-        let new_result = Array::make(result.length() * 2, "")
-        let mut tmp_cur = 0
-        while tmp_cur < result.length() {
-          new_result.set(tmp_cur, result[tmp_cur])
-          tmp_cur = tmp_cur + 1
-        }
-        result = new_result
+        None => return result
       }
+      result.push(sub)
       index = it.index
     }
   }
   let sub = match sub_string(s, index, it.length) {
     Some(sub) => sub
-    None => {return (result, cur)}
+    None => return result
   }
-  result.set(cur, sub)
-  (result, cur)
+  result.push(sub)
+  result
 }
 
 pub fn sub_string(s : String, start : Int, end : Int) -> Option[String] {
@@ -44,7 +33,7 @@ pub fn sub_string(s : String, start : Int, end : Int) -> Option[String] {
   while it.index != it.length {
     let c = match it.next() {
       Some(c) => c
-      None => {return None}
+      None => return None
     }
     if it.index - 1 >= start && it.index - 1 < end {
       result = result + c.to_string()
@@ -65,8 +54,8 @@ pub fn trim(s : String, removed : Char) -> String {
   }
   if start <= end {
     match sub_string(s, start, end + 1) {
-      Some(sub) => {return sub}
-      None => {return s}
+      Some(sub) => return sub
+      None => return s
     }
   }
   s
@@ -79,8 +68,7 @@ pub fn index_of(s : String, pattern : String) -> Option[Int] {
   let l = s.length()
   while s_index < l {
     if s[s_index] == pattern[p_index] {
-      while p_index < pattern.length() &&
-      s_index < l && s[s_index] == pattern[p_index] {
+      while p_index < pattern.length() && s_index < l && s[s_index] == pattern[p_index] {
         s_index = s_index + 1
         p_index = p_index + 1
       }
@@ -105,8 +93,7 @@ pub fn last_index_of(s : String, pattern : String) -> Option[Int] {
   let l = s.length()
   while s_index < l {
     if s[s_index] == pattern[p_index] {
-      while p_index < pattern.length() &&
-      s_index < l && s[s_index] == pattern[p_index] {
+      while p_index < pattern.length() && s_index < l && s[s_index] == pattern[p_index] {
         s_index = s_index + 1
         p_index = p_index + 1
       }

examples/string/lib/string_test.mbt

@@ -0,0 +1,15 @@
+test {
+  let arr = split("a.b.c.e.f.g.h.i.j.k.l.m.n", '.')
+  @assertion.assert_eq(
+    arr,
+    @vec.Vec::["a", "b", "c", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n"],
+  )?
+  inspect(sub_string("Hello World", 3, 7), ~content="Some(lo W)")?
+  ("Hello World" |> index_of("Wo") |> @assertion.assert_eq(Some(6)))?
+  ("Hello World World Hello" |> last_index_of("Wo") |> @assertion.assert_eq(Some(12)))?
+  @assertion.assert_true(contains("Hello World", "Wo"))?
+  let arr = to_char_array("HelloWorld")
+  @assertion.assert_eq(arr, ['H', 'e', 'l', 'l', 'o', 'W', 'o', 'r', 'l', 'd'])?
+  @assertion.assert_eq(char_at("abcde", 4), Some('e'))?
+  @assertion.assert_eq(trim("   abcde   ", ' '), "abcde")?
+}