feat: add single line comments

README.md

@@ -87,6 +87,12 @@ print("2 + 3 = ", result);
 
 In this example, the `adder` function returns a closure that adds the provided value `x` to any value `y` passed to it. The closure `addTwo` adds 2 to its argument `3` and returns the result `5`.
 
+### Single-line Comments Example
+
+```sml
+// This is a single-line comment.
+# This is also a single-line comment.
+```
 ### Array Example
 
 ```sml

evaluator/builtins.go

@@ -98,7 +98,7 @@ var builtins = map[string]*object.Builtin{
 	"input":   {Fn: inputFunc},
 	"int":     {Fn: intFunc},
 	"str":     {Fn: strFunc},
-	//	file system
+
 	"readFile":   {Fn: readFileFunc},
 	"writeFile":  {Fn: writeFileFunc},
 	"removeFile": {Fn: removeFileFunc},

hello.sa

@@ -1,2 +1,10 @@
-let val_10 = 10;
-print("hello Jose \n Im glad you came to my class");
+let adder = fn(x) {
+  fn(y) {
+    x + y;
+  };
+};
+// adder is a function that returns a function
+// addTwo is a function that takes a number and returns a number
+let addTwo = adder(2);
+let result = addTwo(3);
+//print("2 + 3 = ", result);

lexer/lexer.go

@@ -73,7 +73,16 @@ func (l *Lexer) NextToken() token.Token {
 	case '-':
 		tok = newToken(token.MINUS, l.ch)
 	case '/':
+		// check for comment
+		if l.peekChar() == '/' {
+			l.readChar()
+			l.skipComment()
+			return l.NextToken()
+		}
 		tok = newToken(token.SLASH, l.ch)
+	case '#':
+		l.skipComment()
+		return l.NextToken()
 	case '*':
 		tok = newToken(token.ASTERISK, l.ch)
 	case '<':
@@ -128,6 +137,11 @@ func (l *Lexer) readIdentifier() string {
 	return l.input[position:l.position]
 }
 
+func (l *Lexer) skipComment() {
+	for l.ch != '\n' && l.ch != 0 {
+		l.readChar()
+	}
+}
 func newToken(tokenType token.TokenType, ch byte) token.Token {
 	return token.Token{Type: tokenType, Literal: string(ch)}
 }