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38 lines
1.0 KiB
TypeScript
38 lines
1.0 KiB
TypeScript
// Loaded from https://deno.land/x/ramda@v0.27.2/source/lensPath.js
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import _curry1 from './internal/_curry1.js';
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import assocPath from './assocPath.js';
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import lens from './lens.js';
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import path from './path.js';
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/**
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* Returns a lens whose focus is the specified path.
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*
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* @func
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* @memberOf R
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* @since v0.19.0
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* @category Object
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* @typedefn Idx = String | Int | Symbol
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* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
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* @sig [Idx] -> Lens s a
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* @param {Array} path The path to use.
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* @return {Lens}
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* @see R.view, R.set, R.over
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* @example
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*
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* const xHeadYLens = R.lensPath(['x', 0, 'y']);
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*
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* R.view(xHeadYLens, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
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* //=> 2
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* R.set(xHeadYLens, 1, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
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* //=> {x: [{y: 1, z: 3}, {y: 4, z: 5}]}
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* R.over(xHeadYLens, R.negate, {x: [{y: 2, z: 3}, {y: 4, z: 5}]});
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* //=> {x: [{y: -2, z: 3}, {y: 4, z: 5}]}
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*/
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var lensPath = _curry1(function lensPath(p) {
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return lens(path(p), assocPath(p));
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});
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export default lensPath;
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