Given a function, returns a new function with the first two arguments flipped.
npm install fj-flip --save
var flip = require('fj-flip');
var mergeThree = (a, b, c) => ([]).concat(a, b, c);
mergeThree(1, 2, 3); //=> [1, 2, 3]
flip(mergeThree)(1, 2, 3); //=> [2, 1, 3]