jsgen: implement Map.keys() and Map.values() methods (fix #24209) (#24608)

vlib/builtin/js/map.js.v

@@ -47,6 +47,20 @@ pub fn (mut m map) delete(key JS.Any) {
 
 pub fn (m &map) free() {}
 
+pub fn (m map) keys() array {
+	ret := JS.makeEmptyArray()
+	#for (var key in m.map) array_push(ret,new string(`${key}`),false);
+
+	return ret
+}
+
+pub fn (m map) values() array {
+	ret := JS.makeEmptyArray()
+	#for (var key in m.map) array_push(ret,m.map[key],false);
+
+	return ret
+}
+
 //#Object.defineProperty(map.prototype,"len",{get: function() { return this.map.size; }})
 #map.prototype.toString = function () {
 #function fmtKey(key) { return typeof key == 'string' ? '\'' + key + '\'' : key}

vlib/v/gen/js/fn.v

@@ -267,8 +267,11 @@ fn (mut g JsGen) method_call(node ast.CallExpr) {
 	left_sym := g.table.sym(node.left_type)
 	final_left_sym := g.table.final_sym(node.left_type)
 
-	if final_left_sym.kind == .array {
-		if final_left_sym.kind == .array && it.name in ['map', 'filter'] {
+	if final_left_sym.kind == .map && it.name in special_map_methods {
+		g.gen_map_method_call(it)
+		return
+	} else if final_left_sym.kind == .array {
+		if it.name in ['map', 'filter'] {
 			g.expr(it.left)
 			mut ltyp := it.left_type
 			for ltyp.is_ptr() {
@@ -310,18 +313,17 @@ fn (mut g JsGen) method_call(node ast.CallExpr) {
 			return
 		}
 
-		if final_left_sym.kind == .array {
-			if it.name in special_array_methods {
-				g.gen_array_method_call(it)
-				return
-			}
+		if it.name in special_array_methods {
+			g.gen_array_method_call(it)
+			return
 		}
-	}
-	if final_left_sym.kind == .array
-		&& node.name in ['repeat', 'sort_with_compare', 'free', 'push_many', 'trim', 'first', 'last', 'pop', 'clone', 'reverse', 'slice', 'pointers'] {
-		if !(left_sym.info is ast.Alias && typ_sym.has_method(node.name)) {
-			// `array_Xyz_clone` => `array_clone`
-			receiver_type_name = 'array'
+
+		if node.name in ['repeat', 'sort_with_compare', 'free', 'push_many', 'trim', 'first', 'last',
+			'pop', 'clone', 'reverse', 'slice', 'pointers'] {
+			if !(left_sym.info is ast.Alias && typ_sym.has_method(node.name)) {
+				// `array_Xyz_clone` => `array_clone`
+				receiver_type_name = 'array'
+			}
 		}
 	}
 

vlib/v/gen/js/map.v

@@ -0,0 +1,15 @@
+module js
+
+import v.ast
+
+const special_map_methods = [
+	'keys',
+	'values',
+]
+
+fn (mut g JsGen) gen_map_method_call(node ast.CallExpr) {
+	g.write('map_${node.name}(')
+	g.expr(node.left)
+	g.gen_deref_ptr(node.left_type)
+	g.write(')')
+}

vlib/v/gen/js/tests/map.v

@@ -0,0 +1,184 @@
+struct Point {
+	x f64
+	y f64
+}
+
+fn generic_map[T](items map[string]T) []T {
+	return items.values()
+}
+
+fn generic_map_with_constraint[T](items map[string]T) []T {
+	return items.values()
+}
+
+fn generic_map_keys[T](items map[string]T) []string {
+	return items.keys()
+}
+
+fn map_any[T](items []T, cb fn (item T) bool) bool {
+	for item in items {
+		if cb(item) {
+			return true
+		}
+	}
+	return false
+}
+
+fn test_map_values_method() {
+	// testing map[int]stirng
+	items_1 := {
+		1: 'item_1'
+		2: 'item_2'
+		3: 'item_3'
+	}
+	assert items_1.values().len == 3
+	for i, item in items_1.values() {
+		assert item == 'item_${i + 1}'
+	}
+
+	// testing map[string]int
+	items_2 := {
+		'item_1': 1
+		'item_2': 2
+		'item_3': 3
+		'item_4': 4
+	}
+	assert items_2.values().len == 4
+	for i, item in items_2.values() {
+		assert item == i + 1
+	}
+
+	// testing generics
+	items_3 := {
+		'a': 10
+		'b': 20
+		'c': 30
+	}
+	generic_values := generic_map(items_3)
+	assert generic_values.len == 3
+	assert generic_values.contains(10)
+	assert generic_values.contains(20)
+	assert generic_values.contains(30)
+
+	// testing empty map
+	empty_map := map[string]int{}
+	empty_values := empty_map.values()
+	assert empty_values.len == 0
+
+	// testing map with complex types (struct)
+	points := {
+		'origin': Point{0.0, 0.0}
+		'unit_x': Point{1.0, 0.0}
+		'unit_y': Point{0.0, 1.0}
+	}
+	point_values := points.values()
+	assert point_values.len == 3
+	assert map_any(point_values, fn (point Point) bool {
+		return point.x == 0.0 && point.y == 0.0
+	})
+	assert map_any(point_values, fn (point Point) bool {
+		return point.x == 1.0 && point.y == 0.0
+	})
+	assert map_any(point_values, fn (point Point) bool {
+		return point.x == 0.0 && point.y == 1.0
+	})
+}
+
+fn test_map_values_method_with_generic_constraints() {
+	// test with string constraint
+	string_map := {
+		'first':  'hello'
+		'second': 'world'
+	}
+	string_result := generic_map_with_constraint(string_map)
+	assert string_result.len == 2
+	assert string_result.contains('hello')
+	assert string_result.contains('world')
+
+	// test with int constraint
+	int_map := {
+		'one': 1
+		'two': 2
+	}
+	int_result := generic_map_with_constraint(int_map)
+	assert int_result.len == 2
+	assert int_result.contains(1)
+	assert int_result.contains(2)
+}
+
+fn test_map_keys_method() {
+	// testing map[string]int keys
+	items_2 := {
+		'item_1': 1
+		'item_2': 2
+		'item_3': 3
+		'item_4': 4
+	}
+	keys_2 := items_2.keys()
+	assert keys_2.len == 4
+	assert keys_2.contains('item_1')
+	assert keys_2.contains('item_2')
+	assert keys_2.contains('item_3')
+	assert keys_2.contains('item_4')
+
+	// testing empty map keys
+	empty_map := map[string]int{}
+	empty_keys := empty_map.keys()
+	assert empty_keys.len == 0
+
+	// testing map with single element keys
+	single_item := {
+		'only': 42
+	}
+	single_keys := single_item.keys()
+	assert single_keys.len == 1
+	assert single_keys[0] == 'only'
+
+	// testing map with complex types as values but simple keys
+	points := {
+		'origin': Point{0.0, 0.0}
+		'unit_x': Point{1.0, 0.0}
+		'unit_y': Point{0.0, 1.0}
+	}
+	point_keys := points.keys()
+	assert point_keys.len == 3
+	assert point_keys.contains('origin')
+	assert point_keys.contains('unit_x')
+	assert point_keys.contains('unit_y')
+}
+
+fn test_map_keys_method_with_generic_constraints() {
+	// test with string values
+	string_map := {
+		'first':  'hello'
+		'second': 'world'
+		'third':  'test'
+	}
+	string_keys := generic_map_keys(string_map)
+	assert string_keys.len == 3
+	assert string_keys.contains('first')
+	assert string_keys.contains('second')
+	assert string_keys.contains('third')
+
+	// test with struct values
+	point_map := {
+		'origin': Point{0.0, 0.0}
+		'center': Point{5.0, 5.0}
+	}
+	point_keys := generic_map_keys(point_map)
+	assert point_keys.len == 2
+	assert point_keys.contains('origin')
+	assert point_keys.contains('center')
+
+	// test with empty map
+	empty_map := map[string]int{}
+	empty_keys := generic_map_keys(empty_map)
+	assert empty_keys.len == 0
+}
+
+fn main() {
+	test_map_values_method()
+	test_map_values_method_with_generic_constraints()
+	test_map_keys_method()
+	test_map_keys_method_with_generic_constraints()
+}