ramda/src/view.js

var _curry2 =
/*#__PURE__*/
require("./internal/_curry2"); // `Const` is a functor that effectively ignores the function given to `map`.


var Const = function (x) {
  return {
    value: x,
    'fantasy-land/map': function () {
      return this;
    }
  };
};
/**
 * Returns a "view" of the given data structure, determined by the given lens.
 * The lens's focus determines which portion of the data structure is visible.
 *
 * @func
 * @memberOf R
 * @since v0.16.0
 * @category Object
 * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
 * @sig Lens s a -> s -> a
 * @param {Lens} lens
 * @param {*} x
 * @return {*}
 * @see R.prop, R.lensIndex, R.lensProp
 * @example
 *
 *      const xLens = R.lensProp('x');
 *
 *      R.view(xLens, {x: 1, y: 2});  //=> 1
 *      R.view(xLens, {x: 4, y: 2});  //=> 4
 */


var view =
/*#__PURE__*/
_curry2(function view(lens, x) {
  // Using `Const` effectively ignores the setter function of the `lens`,
  // leaving the value returned by the getter function unmodified.
  return lens(Const)(x).value;
});

module.exports = view;