iter-tools-es/impls/$round-robin/internal/validate-args.js

The iterable toolbox

const {
  isInteger
} = require('../../../internal/number.js');

const {
  isObject
} = require('../../is-object/is-object.js');

const {
  notUndefined
} = require('../../not-undefined/not-undefined.js');

const makeValidateArgs = methodName => function validateArgs(args) {
  if (isObject(args[1])) {
    const {
      start,
      step
    } = args[1];
    args[1] = start;
    args[2] = step;
  }

  if (notUndefined(args[2])) {
    args[2] = Number(args[2]);

    if (!isInteger(args[2], true)) {
      throw new Error(`step argument to ${methodName} must be a non-zero integer`);
    }
  }
};

exports.makeValidateArgs = makeValidateArgs;