diff --git a/SLS_C/src/builtin.c b/SLS_C/src/builtin.c
index 31b9fc2..5424c4b 100644
--- a/SLS_C/src/builtin.c
+++ b/SLS_C/src/builtin.c
@@ -2009,6 +2009,49 @@ Boolean builtin_type_of(InterpreterState *interpreter_state) {
 }
 
 Boolean builtin_while(InterpreterState *interpreter_state) {
-    (void)interpreter_state;
-    return FALSE;
+    if (interpreter_state->stack == NULL) return FALSE;
+    StackItem *while_block = interpreter_state->stack;
+    if (while_block->next == NULL) return FALSE;
+    StackItem *conditional_block = while_block->next;
+
+    if (!(
+        while_block->type == STACK_TOKEN_STRING ||
+        while_block->type == STACK_CALLABLE ||
+        while_block->type == STACK_IDENTIFIER
+    )) return FALSE;
+
+    if (!(
+        conditional_block->type == STACK_TOKEN_STRING ||
+        conditional_block->type == STACK_CALLABLE ||
+        conditional_block->type == STACK_IDENTIFIER
+    )) return FALSE;
+
+    interpreter_state->stack = conditional_block->next;
+    conditional_block->next = NULL;
+
+    Boolean return_value = FALSE;
+    while (TRUE) {
+        if (conditional_block->type == STACK_TOKEN_STRING || conditional_block->type == STACK_CALLABLE)
+            return_value = execute_token_string(interpreter_state, conditional_block->token_string);
+        else if (conditional_block->type == STACK_IDENTIFIER)
+            return_value = execute_func(interpreter_state, conditional_block->identifier.name);
+        if (!return_value) break;
+        if (interpreter_state->stack == NULL) return FALSE;
+
+        StackItem *conditional = interpreter_state->stack;
+        interpreter_state->stack = conditional->next;
+        conditional->next = NULL;
+        TRUTHY;
+        clean_stack(conditional);
+        if (!value) break;
+
+        if (while_block->type == STACK_TOKEN_STRING || while_block->type == STACK_CALLABLE)
+            return_value = execute_token_string(interpreter_state, while_block->token_string);
+        else if (while_block->type == STACK_IDENTIFIER)
+            return_value = execute_func(interpreter_state, while_block->identifier.name);
+        if (!return_value) break;
+    }
+
+    clean_stack(while_block);
+    return return_value;
 }
diff --git a/SLS_C/src/interpreter.c b/SLS_C/src/interpreter.c
index 4802f46..a7d905a 100644
--- a/SLS_C/src/interpreter.c
+++ b/SLS_C/src/interpreter.c
@@ -186,13 +186,15 @@ Boolean execute_func(InterpreterState *interpreter_state, SlsStr key) {
 }
 
 Boolean execute_token_string(InterpreterState *interpreter_state, TokenString token_string) {
+    Boolean return_value = FALSE;
     for (size_t i = 0; i < token_string.length; i++) {
         if (token_string.tokens[i].type == TOKEN_IDENTIFIER && !token_string.tokens[i].identifier.is_literal)
-        return execute_func(interpreter_state, token_string.tokens[i].identifier.name);
-    else
-        return push_token(interpreter_state, token_string.tokens[i]);
+            return_value = execute_func(interpreter_state, token_string.tokens[i].identifier.name);
+        else
+            return_value = push_token(interpreter_state, token_string.tokens[i]);
+        if (!return_value) break;
     }
-    return FALSE;
+    return return_value;
 }
 
 Boolean execute(InterpreterState *interpreter_state, LexerTokenResult *token) {