don't panic if there are not enough operands

2 files changed, 4 insertions, 9 deletions

diff --git a/calc.go b/calc.go
index 2fb1699..47ece5b 100644
--- a/calc.go
+++ b/calc.go
@@ -51,20 +51,17 @@ func (c *Calculator) negate() {
 }
 
 // performOp performs the specified arithmetic operation.
-func (c *Calculator) performOperation(operator byte) error {
+func (c *Calculator) performOperation(operator byte) {
 	fn, err := parseOperator(operator)
 	if err != nil {
-		return err
+		return
 	}
-
 	lhs, rhs, err := c.operands()
 	if err != nil {
-		return err
+		return
 	}
-
 	c.stack.push(fn(lhs, rhs))
 	c.buf = ""
-	return nil
 }
 
 // operands returns the left and right operands, or error if there are not enough.
diff --git a/ui.go b/ui.go
index bd39eaf..4d121a7 100644
--- a/ui.go
+++ b/ui.go
@@ -54,9 +54,7 @@ func (ui UI) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			ui.calc.negate()
 		case "+", "-", "*", "/", "%", "^":
 			operator := msg.String()[0]
-			if err := ui.calc.performOperation(operator); err != nil {
-				panic(err)
-			}
+			ui.calc.performOperation(operator)
 		case "backspace":
 			if len(ui.calc.buf) > 0 {
 				ui.calc.buf = ui.calc.buf[:len(ui.calc.buf)-1]