foop
Version:
interfaces that describe their intentions.
44 lines (42 loc) • 3.51 kB
JavaScript
var argumentor = require('../cast/argumentor')
var curry = require('./curry')
/**
* Returns a new function much like the supplied one, except that the first two
* arguments' order is reversed.
*
* @memberOf fp
* @symb 🙃🙃
* @since 5.0.0-beta.4
*
* @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.
*
* @extends fp/flip
* @variation just flip, but flips arg 1-2 instead of reversing all arguments
* @see fp/flip
* @TODO flipN
*
* @types fp
* @tests fp/flip2
*
* @example
*
* var mergeThree = (a, b, c) => [].concat(a, b, c)
* mergeThree(1, 2, 3); //=> [1, 2, 3]
* flip(mergeThree)(1, 2, 3); //=> [2, 1, 3]
*
* const flipped = flip((...args) => args)
* flipped('a', 'b', 'c', 'd')
* //=> ['b', 'a', 'c', 'd']
*
*/
module.exports = function flip2(fn) {
return curry(2, function(a, b) {
var args = argumentor.apply(null, arguments)
// .slice(n).reverse().splice()
args[0] = b
args[1] = a
return fn.apply(this, args)
})
}
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