lens

v0.9.6

STATUS

Passing

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VISIBILITY

Public

PUBLISHED

5 years ago

SIZE

2 KB

Returns a lens for the given getter and setter functions.

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lens (

getter:Function,

setter:Function

) : Lens

Returns a lens for the given getter and setter functions. The getter “gets” the value of the focus; the setter “sets” the value of the focus. The setter should not mutate the data structure.

Example

const xLens = R.lens(R.prop('x'), R.assoc('x'));

     R.view(xLens, {x: 1, y: 2});            //=> 1
     R.set(xLens, 4, {x: 1, y: 2});          //=> {x: 4, y: 2}
     R.over(xLens, R.negate, {x: 1, y: 2});  //=> {x: -1, y: 2}

Arguments

getter: Function

setter: Function

Returns

Lens