calcium-lang/dist/builtin/enumerate.js

Calcium language interpreter

import { default as Sym } from "../symbol";
import { evaluate } from "../util";
import createIterator from "../factory/iterator";
import { createInt } from "../factory";
import createTuple from "../factory/tuple";
/**
 * built-in `enumerate()` function
 * @param args accept an argument that is iterable
 * @param env
 * @returns a tuple with an index and an element
 */
const enumerate = (args, env) => {
    const iterable = evaluate(args[0], env);
    const iterator = Reflect.get(iterable, Sym.iter);
    const enumerateObject = createIterator({
        name: "enumerate object",
        next: (index) => {
            const nextValue = Reflect.get(iterator, Sym.next);
            if (nextValue === null)
                return null;
            else
                return createTuple(createInt(index), nextValue);
        },
    });
    return enumerateObject;
};
export default enumerate;
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