hash-count

compiler/kernel-primitives.rkt

@@ -109,6 +109,7 @@
                                     'hash-remove!
                                     'hash-remove
                                     'equal-hash-code
+                                    'hash-count
                                     
                                     'string-copy
                                     ))

js-assembler/runtime-src/baselib-hashes.js

@@ -137,6 +137,10 @@
         return new WhalesongHashtable(this.type, this.hash_function, this.equality_function, this.hash.clone());
     };
 
+    WhalesongHashtable.prototype.size = function() {
+        return this.hash.size();
+    };
+
     WhalesongHashtable.prototype.toWrittenString = function (cache) {
         var keys = this.hash.keys();
         var ret = [], i;
@@ -251,6 +255,11 @@
         this.map = map;
     };
 
+    WhalesongImmutableHashtable.prototype.size = function() {
+        return this.map.items().length;
+    };
+
+
     WhalesongImmutableHashtable.prototype.toWrittenString = function (cache) {
         var items = this.map.items();
         var ret = [], i;

js-assembler/runtime-src/baselib-primitives.js

@@ -2579,6 +2579,13 @@
             return hash.clone();
         });
     
+    installPrimitiveProcedure(
+        'hash-count',
+        1,
+        function(M) {
+            return checkHash(M, 'hash-count', 0).size();
+        });
+
     installPrimitiveProcedure(
         'hash',
         baselib.arity.makeArityAtLeast(0),

lang/kernel.rkt

@@ -168,6 +168,7 @@
          hash-remove!
          hash-remove
          equal-hash-code
+         hash-count
          
 
 

tests/more-tests/hashes.expected

@@ -55,3 +55,6 @@ true
 
 A
 alphabet
+
+1
+2

tests/more-tests/hashes.rkt

@@ -132,3 +132,9 @@
   (hash-set! h2 'a "alphabet")
   (displayln (hash-ref h1 'a))
   (displayln (hash-ref h2 'a)))
+
+
+(newline)
+(hash-count (make-hash '((a . a))))
+(hash-count (make-immutable-hash '((b . b)
+                                   (c . d))))