"use strict";

const isArrayOf = require("./arrayOf");

const isSize = require("./size");

const isTwo = size => size === 2; // @TODO can also add "isPairsLike" to just check ONE
// @TODO can also do this
// const firstOfFirst = pipeTwo(first, first)
// isPairs = x =>
//   multiDimensionalArray(x) && isStringOrNumber(firstOfFirst(x))

/* prettier-ignore */

/**
 * @since 5.0.0-beta.9
 * @memberOf is
 *
 * @name isPairs
 * @alias isArrayPairs
 * @alias isArrayOfPairs
 * @alias isPairedArray
 * @alias isMultiDimensionalArray
 * @alias isNestedArray
 *
 * @param {Array<Array> | *} x possible pairs
 * @return {boolean} x isPairs
 *
 * @TODO @FIXME @HACK @TIME remove the `isTwo`
 * @see is/arrayOf
 * @NOTE could also be written similar to `pipeTwo(first, isArray)`
 *
 * @example isPairs([[1, 2], [1, 2]]) //=> true
 * @example isPairs([[1], [1, 2]])    //=> false
 * @example isPairs([])               //=> false
 *
 */


module.exports = function isPairs(x) {
  return isArrayOf(isArrayOf(isSize(isTwo)));
};