diff --git a/lib.nas b/lib.nas
index 65a3f47..55986f7 100644
--- a/lib.nas
+++ b/lib.nas
@@ -66,7 +66,7 @@ var floor=func(val){
     return __builtin_floor(val);
 }
 
-# abs gets absolute number
+# abs gets absolute number.
 var abs=func(n){
     return n>0?n:-n;
 }
@@ -126,6 +126,11 @@ var die=func(str){
     return __builtin_die(str);
 }
 
+# find will give the first position of the needle in haystack
+var find=func(needle,haystack){
+    return __builtin_find(needle,haystack);
+}
+
 # typeof is used to get the type of an object.
 # this function returns a string.
 var typeof=func(object){
@@ -175,11 +180,20 @@ var chr=func(code){
 
 # mut is used to change unmutable strings to mutable.
 var mut=func(str){
-    if(typeof(str)!="str")
-        die("mut: \"str\" must be string.");
     return str~"";
 }
 
+# srand wraps up rand, using time(0) as the seed.
+var srand=func(){
+    rand(time(0));
+    return 0;
+}
+
+# values() gets all values in a hash.
+var values=func(hash){
+    return __builtin_values(hash);
+}
+
 # println has the same function as print.
 # but it will output a '\n' after using print.
 var println=func(elems...){
@@ -193,7 +207,7 @@ var isfunc=func(f){
 }
 
 var isghost=func(g){
-    die("this runtime have no ghost object");
+    die("this runtime has no ghost object");
     return 0;
 }
 
diff --git a/nasal_builtin.h b/nasal_builtin.h
index 5d17c79..da5f205 100644
--- a/nasal_builtin.h
+++ b/nasal_builtin.h
@@ -46,6 +46,7 @@ nas_native(builtin_delete);
 nas_native(builtin_keys);
 nas_native(builtin_import);
 nas_native(builtin_die);
+nas_native(builtin_find);
 nas_native(builtin_type);
 nas_native(builtin_substr);
 nas_native(builtin_streq);
@@ -53,6 +54,7 @@ nas_native(builtin_left);
 nas_native(builtin_right);
 nas_native(builtin_cmp);
 nas_native(builtin_chr);
+nas_native(builtin_values);
 nas_native(builtin_open);
 nas_native(builtin_close);
 nas_native(builtin_read);
@@ -135,6 +137,7 @@ struct
     {"__builtin_keys",    builtin_keys    },
     {"__builtin_import",  builtin_import  },
     {"__builtin_die",     builtin_die     },
+    {"__builtin_find",    builtin_find    },
     {"__builtin_type",    builtin_type    },
     {"__builtin_substr",  builtin_substr  },
     {"__builtin_streq",   builtin_streq   },
@@ -142,6 +145,7 @@ struct
     {"__builtin_right",   builtin_right   },
     {"__builtin_cmp",     builtin_cmp     },
     {"__builtin_chr",     builtin_chr     },
+    {"__builtin_values",  builtin_values  },
     {"__builtin_open",    builtin_open    },
     {"__builtin_close",   builtin_close   },
     {"__builtin_read",    builtin_read    },
@@ -617,6 +621,19 @@ nasal_ref builtin_die(nasal_ref* local,nasal_gc& gc)
     std::cerr<<"[vm] error: "<<str.str()<<'\n';
     return nasal_ref(vm_none);
 }
+nasal_ref builtin_find(nasal_ref* local,nasal_gc& gc)
+{
+    nasal_ref needle=local[1];
+    nasal_ref haystack=local[2];
+    if(needle.type!=vm_str)
+        return builtin_err("find","\"needle\" must be string");
+    if(haystack.type!=vm_str)
+        return builtin_err("find","\"haystack\" must be string");
+    size_t pos=haystack.str().find(needle.str());
+    if(pos==std::string::npos)
+        return {vm_num,(double)-1};
+    return {vm_num,(double)pos};
+}
 nasal_ref builtin_type(nasal_ref* local,nasal_gc& gc)
 {
     nasal_ref val=local[1];
@@ -737,6 +754,17 @@ nasal_ref builtin_chr(nasal_ref* local,nasal_gc& gc)
         ret.str()=" ";
     return ret;
 }
+nasal_ref builtin_values(nasal_ref* local,nasal_gc& gc)
+{
+    nasal_ref hash=local[1];
+    if(hash.type!=vm_hash)
+        return builtin_err("values","\"hash\" must be a hashmap");
+    nasal_ref vec=gc.alloc(vm_vec);
+    auto& v=vec.vec().elems;
+    for(auto& i:hash.hash().elems)
+        v.push_back(i.second);
+    return vec;
+}
 void obj_file_destructor(void* ptr)
 {
     fclose((FILE*)ptr);
diff --git a/stl/lib.nas b/stl/lib.nas
index 65a3f47..55986f7 100644
--- a/stl/lib.nas
+++ b/stl/lib.nas
@@ -66,7 +66,7 @@ var floor=func(val){
     return __builtin_floor(val);
 }
 
-# abs gets absolute number
+# abs gets absolute number.
 var abs=func(n){
     return n>0?n:-n;
 }
@@ -126,6 +126,11 @@ var die=func(str){
     return __builtin_die(str);
 }
 
+# find will give the first position of the needle in haystack
+var find=func(needle,haystack){
+    return __builtin_find(needle,haystack);
+}
+
 # typeof is used to get the type of an object.
 # this function returns a string.
 var typeof=func(object){
@@ -175,11 +180,20 @@ var chr=func(code){
 
 # mut is used to change unmutable strings to mutable.
 var mut=func(str){
-    if(typeof(str)!="str")
-        die("mut: \"str\" must be string.");
     return str~"";
 }
 
+# srand wraps up rand, using time(0) as the seed.
+var srand=func(){
+    rand(time(0));
+    return 0;
+}
+
+# values() gets all values in a hash.
+var values=func(hash){
+    return __builtin_values(hash);
+}
+
 # println has the same function as print.
 # but it will output a '\n' after using print.
 var println=func(elems...){
@@ -193,7 +207,7 @@ var isfunc=func(f){
 }
 
 var isghost=func(g){
-    die("this runtime have no ghost object");
+    die("this runtime has no ghost object");
     return 0;
 }
 
diff --git a/test/scalar.nas b/test/scalar.nas
index c23a594..266e43e 100644
--- a/test/scalar.nas
+++ b/test/scalar.nas
@@ -166,4 +166,13 @@ print(
     isvec([]),' ',isvec("[]"),'\n',
     vecindex([0,1,2,3,4],1),'\n',
     vecindex(["apple","banana"],"apple")!=nil,'\n'
-);
\ No newline at end of file
+);
+
+println(values({
+    a:1,
+    b:2,
+    c:3
+}));
+println(find("cd", "abcdef")); # prints 2
+println(find("x", "abcdef")); # prints -1
+println(find("cd", "abcdef")); # prints 2
\ No newline at end of file