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rl_lang/interpreter/stdlib/array/
arr_first.rs

1use crate::{
2    interpreter::{evaluator::Evaluator, values::Value},
3    utils::{errors::Error, span::Span},
4};
5
6pub fn std_arr_first(eval: &mut Evaluator, array: Value, span: Span) -> Result<Value, Error> {
7    match array {
8        Value::Values { items, .. } => match items.into_iter().next() {
9            Some(v) => Ok(v),
10            None => Err(eval.err("arr_first() called on empty array".to_string(), span)),
11        },
12        _ => Err(eval.err("arr_first() accepts only arrays".to_string(), span)),
13    }
14}