diff --git a/lib.nas b/lib.nas
index 65a8882..65a3f47 100644
--- a/lib.nas
+++ b/lib.nas
@@ -211,7 +211,7 @@ var isnum=func(x){
 
 var isscalar=func(s){
     var t=typeof(s);
-    return t=="num" or t=="str";
+    return (t=="num" or t=="str")?1:0;
 }
 
 var isstr=func(s){
@@ -223,7 +223,9 @@ var isvec=func(v){
 }
 
 var vecindex=func(vec,val){
-    # unfinished
+    forindex(var i;vec)
+        if(val==vec[i])
+            return i;
     return nil;
 }
 
diff --git a/nasal_vm.h b/nasal_vm.h
index 556c996..8336b7d 100644
--- a/nasal_vm.h
+++ b/nasal_vm.h
@@ -521,7 +521,8 @@ inline void nasal_vm::opr_eq()
         gc.top[0]=one;
     else if(val1.type==vm_str && val2.type==vm_str)
         gc.top[0]=(val1.str()==val2.str())?one:zero;
-    else if(val1.type==vm_num || val2.type==vm_num)
+    else if((val1.type==vm_num || val2.type==vm_num)
+        && val1.type!=vm_nil && val2.type!=vm_nil)
         gc.top[0]=(val1.to_number()==val2.to_number())?one:zero;
     else
         gc.top[0]=(val1==val2)?one:zero;
@@ -534,7 +535,8 @@ inline void nasal_vm::opr_neq()
         gc.top[0]=zero;
     else if(val1.type==vm_str && val2.type==vm_str)
         gc.top[0]=(val1.str()!=val2.str())?one:zero;
-    else if(val1.type==vm_num || val2.type==vm_num)
+    else if((val1.type==vm_num || val2.type==vm_num)
+        && val1.type!=vm_nil && val2.type!=vm_nil)
         gc.top[0]=(val1.to_number()!=val2.to_number())?one:zero;
     else
         gc.top[0]=(val1!=val2)?one:zero;
diff --git a/stl/lib.nas b/stl/lib.nas
index 65a8882..65a3f47 100644
--- a/stl/lib.nas
+++ b/stl/lib.nas
@@ -211,7 +211,7 @@ var isnum=func(x){
 
 var isscalar=func(s){
     var t=typeof(s);
-    return t=="num" or t=="str";
+    return (t=="num" or t=="str")?1:0;
 }
 
 var isstr=func(s){
@@ -223,7 +223,9 @@ var isvec=func(v){
 }
 
 var vecindex=func(vec,val){
-    # unfinished
+    forindex(var i;vec)
+        if(val==vec[i])
+            return i;
     return nil;
 }
 
diff --git a/test/scalar.nas b/test/scalar.nas
index 7cccca2..c23a594 100644
--- a/test/scalar.nas
+++ b/test/scalar.nas
@@ -149,4 +149,21 @@ f1() or f2();
 # print '1'
 # this means that when using 'or' or 'and',
 # if the result is clear when calculating,
-# objects behind will not be calculated
\ No newline at end of file
+# objects behind will not be calculated
+
+print(
+    subvec([0,1,2,3],2),'\n',
+    subvec([0,1,2,3],2,1),'\n',
+    abs(1),'\n',
+    abs(-1),'\n',
+    systime(),'\n',
+    isfunc(func{}),' ',isfunc([]),'\n',
+    ishash({}),' ',ishash([]),'\n',
+    isint(114.514),' ',isint(114514),'\n',
+    isnum("0xaa55"),' ',isnum("?"),'\n',
+    isscalar(0.618),' ',isscalar("hello"),' ',isscalar([]),'\n',
+    isstr("hello"),' ',isstr(func{}),'\n',
+    isvec([]),' ',isvec("[]"),'\n',
+    vecindex([0,1,2,3,4],1),'\n',
+    vecindex(["apple","banana"],"apple")!=nil,'\n'
+);
\ No newline at end of file