update examples

examples/04_Greatest_Common_Divisor.mers

@@ -3,10 +3,10 @@ gcd := vals -> {
     (a, b) := vals
     if a.eq(b)
       (a)
-    else if a.diff(b).signum.eq(1)
-      &vals = (a, a.diff(b))
+    else if b.subtract(a).signum.eq(1)
+      &vals = (a, b.subtract(a))
     else
-      &vals = (b.diff(a), b)
+      &vals = (a.subtract(b), b)
   }
 }.loop
 

examples/05_Matrix_Multiplicator.mers

@@ -62,7 +62,7 @@ read_matrix_line := width -> {
       if w.eq(0) {
         width = line.len
       } else {
-        {() -> if line.len.diff(w).signum.eq(1) {
+        {() -> if line.len.subtract(w).signum.eq(-1) {
           &line.push(0.0)
         } else (())}.loop
       }
@@ -86,10 +86,10 @@ matrix_get := (matrix, (line, col)) -> {
 
 leftpad := (str, l) -> {
   str := (str).concat
-  d := str.len.diff(l)
+  d := l.subtract(str.len)
   {() -> if d.signum.eq(1) {
     &str = (" ", str).concat
-    &d = 1.diff(d)
+    &d = d.subtract(1)
   } else {(())}}.loop
   str
 }
@@ -100,11 +100,11 @@ matrix_print := matrix -> {
   val_len := 0
   matrix.for_each(line -> {
     l := line.len
-    if l.diff(width).signum.eq(-1)
+    if width.subtract(l).signum.eq(-1)
       &width = l
     line.for_each(val -> {
       l := (val).concat.len
-      if l.diff(val_len).eq(-1)
+      if val_len.subtract(l).eq(-1)
         &val_len = l
     })
   })

examples/iter.mers

@@ -68,7 +68,7 @@ range := (min, max, inc) -> {
   val := min
   () -> {
     // -1 if val > max, 1 if max > val, 0 if max = val
-    should_inc := ((val, max).diff.signum, inc.signum).eq
+    should_inc := ((max, val).subtract.signum, inc.signum).eq
     if should_inc {
       v := val
       &val = (val, inc).sum