flip.js•912 B
var _curry1 = require('./internal/_curry1');
var _slice = require('./internal/_slice');
var curry = require('./curry');
/**
* Returns a new function much like the supplied one, except that the first two
* arguments' order is reversed.
*
* @func
* @memberOf R
* @since v0.1.0
* @category Function
* @sig (a -> b -> c -> ... -> z) -> (b -> a -> c -> ... -> z)
* @param {Function} fn The function to invoke with its first two parameters reversed.
* @return {*} The result of invoking `fn` with its first two parameters' order reversed.
* @example
*
* var mergeThree = (a, b, c) => [].concat(a, b, c);
*
* mergeThree(1, 2, 3); //=> [1, 2, 3]
*
* R.flip(mergeThree)(1, 2, 3); //=> [2, 1, 3]
*/
module.exports = _curry1(function flip(fn) {
return curry(function(a, b) {
var args = _slice(arguments);
args[0] = b;
args[1] = a;
return fn.apply(this, args);
});
});