2 files changed, 34 insertions, 12 deletions

diff --git a/src/jq/execute.zig b/src/jq/execute.zig
index 0565004..282a35c 100644
--- a/src/jq/execute.zig
+++ b/src/jq/execute.zig
@@ -187,12 +187,7 @@ pub const Runtime = struct {
                     std.debug.assert(self.values.ensureSize(1));
 
                     const value = self.values.pop();
-                    const is_falsy = switch (value) {
-                        .null => true,
-                        .bool => |b| !b,
-                        else => false,
-                    };
-                    if (is_falsy) {
+                    if (jv.ops.isFalsy(value)) {
                         self.pc += offset - 1;
                     }
                     // FIXME: optimize pop and push
@@ -334,12 +329,7 @@ pub const Runtime = struct {
                     _ = self.values.pop();
                     const lhs = self.values.pop();
                     const rhs = self.values.pop();
-                    const is_falsy = switch (lhs) {
-                        .null => true,
-                        .bool => |b| !b,
-                        else => false,
-                    };
-                    try self.values.push(if (is_falsy) rhs else lhs);
+                    try self.values.push(if (jv.ops.isFalsy(lhs)) rhs else lhs);
                 },
                 .@"const" => |idx| {
                     std.debug.assert(self.values.ensureSize(1));
diff --git a/src/jv/ops.zig b/src/jv/ops.zig
index 3c702c8..21f9efb 100644
--- a/src/jv/ops.zig
+++ b/src/jv/ops.zig
@@ -186,3 +186,35 @@ test "compare different types" {
     try std.testing.expectError(error.InvalidType, compare(.{ .integer = 1 }, .{ .string = "1" }, .eq));
     try std.testing.expectError(error.InvalidType, compare(.null, .{ .integer = 0 }, .eq));
 }
+
+pub fn isFalsy(value: Value) bool {
+    return switch (value) {
+        .null => true,
+        .bool => |b| !b,
+        else => false,
+    };
+}
+
+pub fn isTruthy(value: Value) bool {
+    return !isFalsy(value);
+}
+
+test "isFalsy" {
+    try std.testing.expect(isFalsy(.null));
+    try std.testing.expect(isFalsy(.{ .bool = false }));
+    try std.testing.expect(!isFalsy(.{ .bool = true }));
+    try std.testing.expect(!isFalsy(.{ .integer = 0 }));
+    try std.testing.expect(!isFalsy(.{ .integer = 1 }));
+    try std.testing.expect(!isFalsy(.{ .string = "" }));
+    try std.testing.expect(!isFalsy(.{ .string = "hello" }));
+}
+
+test "isTruthy" {
+    try std.testing.expect(!isTruthy(.null));
+    try std.testing.expect(!isTruthy(.{ .bool = false }));
+    try std.testing.expect(isTruthy(.{ .bool = true }));
+    try std.testing.expect(isTruthy(.{ .integer = 0 }));
+    try std.testing.expect(isTruthy(.{ .integer = 1 }));
+    try std.testing.expect(isTruthy(.{ .string = "" }));
+    try std.testing.expect(isTruthy(.{ .string = "hello" }));
+}