ramda/src/internal/_isArrayLike.js

A practical functional library for JavaScript programmers.

var _curry1 = /*#__PURE__*/require("./_curry1.js");
var _isArray = /*#__PURE__*/require("./_isArray.js");
var _isString = /*#__PURE__*/require("./_isString.js");
/**
 * Tests whether or not an object is similar to an array.
 *
 * @private
 * @category Type
 * @category List
 * @sig * -> Boolean
 * @param {*} x The object to test.
 * @return {Boolean} `true` if `x` has a numeric length property and extreme indices defined; `false` otherwise.
 * @example
 *
 *      _isArrayLike([]); //=> true
 *      _isArrayLike(true); //=> false
 *      _isArrayLike({}); //=> false
 *      _isArrayLike({length: 10}); //=> false
 *      _isArrayLike({0: 'zero', 9: 'nine', length: 10}); //=> true
 *      _isArrayLike({nodeType: 1, length: 1}) // => false
 */
var _isArrayLike = /*#__PURE__*/_curry1(function isArrayLike(x) {
  if (_isArray(x)) {
    return true;
  }
  if (!x) {
    return false;
  }
  if (typeof x !== 'object') {
    return false;
  }
  if (_isString(x)) {
    return false;
  }
  if (x.length === 0) {
    return true;
  }
  if (x.length > 0) {
    return x.hasOwnProperty(0) && x.hasOwnProperty(x.length - 1);
  }
  return false;
});
module.exports = _isArrayLike;