forked from waja/action-debian-package
32 lines
826 B
JavaScript
32 lines
826 B
JavaScript
import _curry1 from "./internal/_curry1.js";
|
|
import lens from "./lens.js";
|
|
import nth from "./nth.js";
|
|
import update from "./update.js";
|
|
/**
|
|
* Returns a lens whose focus is the specified index.
|
|
*
|
|
* @func
|
|
* @memberOf R
|
|
* @since v0.14.0
|
|
* @category Object
|
|
* @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
|
|
* @sig Number -> Lens s a
|
|
* @param {Number} n
|
|
* @return {Lens}
|
|
* @see R.view, R.set, R.over, R.nth
|
|
* @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']
|
|
*/
|
|
|
|
var lensIndex =
|
|
/*#__PURE__*/
|
|
_curry1(function lensIndex(n) {
|
|
return lens(nth(n), update(n));
|
|
});
|
|
|
|
export default lensIndex; |