reverse - nodef/extra-function GitHub Wiki

Generate a parameter-reversed version of a function.

function reverse(x)
// x: a function

const xfunction = require('extra-function');


function divide(x, y) {
  return x/y;
}

var fn = xfunction.reverse(divide);
fn(2, 4);
// → 2
fn(2, 6);
// → 3
fn(2, 8);
// → 4


var array = [1];

function push(...args) {
  array.push(...args);
}

var fn = xfunction.reverse(push);
fn(2, 3, 4);  // push(2, 3, 4) in reverse order
array;
// → [1, 4, 3, 2]