lib/utils.js

const inspect = require("util").inspect;

const ins = x => inspect(x, { depth: "null" });

const chunk = function*(arr, step) {
  for (let i = 0; i < arr.length; i += step) {
    yield arr.slice(i, i + step);
  }
};

const checkIterable = (object, length) => {
  if (length === 0) {
    throw new SyntaxError("At least one index must be passed to sub");
  }

  if (object instanceof Number || object instanceof String) {
    throw new TypeError(`The object '${object}'' is not indexable!`);
  }
};

const getValidIndex = (length, index) => {
  if (index < 0) {
    index = length + index;
  }

  if (index > length) {
    throw new RangeError(`Index ${index} is out of bounds. Array size: ${length}`);
  }

  return index;
};

module.exports = {
  chunk,
  checkIterable,
  getValidIndex,
  ins
};