lens-path

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

3 KB

Returns a lens whose focus is the specified path.

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lensPath (

path:Array

) : Lens

Returns a lens whose focus is the specified path.

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}]}

Argument

path: Array

The path to use.

Returns

Lens