lens-index

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 index.

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lensIndex (

n:Number

) : Lens

Returns a lens whose focus is the specified index.

Example

const headLens = R.lensIndex(0);

     R.view(headLens, ['a', 'b', 'c']);            //=> 'a'
     R.set(headLens, 'x', ['a', 'b', 'c']);        //=> ['x', 'b', 'c']
     R.over(headLens, R.toUpper, ['a', 'b', 'c']); //=> ['A', 'b', 'c']

Argument

n: Number

Returns

Lens