36 lines
988 B
JavaScript
36 lines
988 B
JavaScript
|
import _curry1 from "./internal/_curry1.js";
|
||
|
|
import assocPath from "./assocPath.js";
|
||
|
|
import lens from "./lens.js";
|
||
|
|
import path from "./path.js";
|
||
|
|
/**
|
||
|
|
* Returns a lens whose focus is the specified path.
|
||
|
|
*
|
||
|
|
* @func
|
||
|
|
* @memberOf R
|
||
|
|
* @since v0.19.0
|
||
|
|
* @category Object
|
||
|
|
* @typedefn Idx = String | Int
|
||
|
|
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
|
||
|
|
* @sig [Idx] -> Lens s a
|
||
|
|
* @param {Array} path The path to use.
|
||
|
|
* @return {Lens}
|
||
|
|
* @see R.view, R.set, R.over
|
||
|
|
* @example
|
||
|
|
*
|
||
|
|
* const xHeadYLens = R.lensPath(['x', 0, 'y']);
|
||
|
|
*
|
||
|
|
* R.view(xHeadYLens, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
|
||
|
|
* //=> 2
|
||
|
|
* R.set(xHeadYLens, 1, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
|
||
|
|
* //=> {x: [{y: 1, z: 3}, {y: 4, z: 5}]}
|
||
|
|
* R.over(xHeadYLens, R.negate, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
|
||
|
|
* //=> {x: [{y: -2, z: 3}, {y: 4, z: 5}]}
|
||
|
|
*/
|
||
|
|
|
||
|
|
var lensPath =
|
||
|
|
/*#__PURE__*/
|
||
|
|
_curry1(function lensPath(p) {
|
||
|
|
return lens(path(p), assocPath(p));
|
||
|
|
});
|
||
|
|
|
||
|
|
export default lensPath;
|