var _curry2 = require('./internal/_curry2');


/**
 * Returns the second argument if it is not `null`, `undefined` or `NaN`;
 * otherwise the first argument is returned.
 *
 * @func
 * @memberOf R
 * @since v0.10.0
 * @category Logic
 * @sig a -> b -> a | b
 * @param {a} default The default value.
 * @param {b} val `val` will be returned instead of `default` unless `val` is `null`, `undefined` or `NaN`.
 * @return {*} The second value if it is not `null`, `undefined` or `NaN`, otherwise the default value
 * @example
 *
 *      var defaultTo42 = R.defaultTo(42);
 *
 *      defaultTo42(null);  //=> 42
 *      defaultTo42(undefined);  //=> 42
 *      defaultTo42('Ramda');  //=> 'Ramda'
 *      // parseInt('string') results in NaN
 *      defaultTo42(parseInt('string')); //=> 42
 */
module.exports = _curry2(function defaultTo(d, v) {
  return v == null || v !== v ? d : v;
});