absoluteValue.js

const handleErrors = (params) => {
  if (params.length === 0) throw new Error('Must provide one or more parameters');
  if (params.some(param => typeof param !== 'number')) {
    throw new Error('One of your parameters does not evaluate to a number');
  }
  // JS can only safely represent and compare integers
  // between Number.MAX_SAFE_INTEGER and Number.MAX_SAFE_INTEGER
  if (params.some(param => param > Number.MAX_SAFE_INTEGER || param < Number.MIN_SAFE_INTEGER)) {
    throw new Error('Cannot reliably test primality of numbers larger than 9,007,199,254,740,991 or smaller than -9,007,199,254,740,991');
  }
};

/**
 * This function converts all numbers to a positive number
 * @memberof variadic
 * @author tdnelson2
 * @param {...*} params - One or more parameters.
 */
exports.absoluteValue = (...params) => {
  handleErrors(params);
  return params.map(num => Math.abs(num));
};