Partial-evaluation for javascript.

partial-evaluation.js

/** pe
 * @argument f: the multiple-argument function to turn into a partially-evaluatable
 * @returns : A single-argument function that applies its argument as the first argument of f, and returns the partially-evaluated function
 * @exemple: pe((a,b)=>a+b)(9)(1) === 10
 */
function pe(f, context, args) {
  if(!args) args = [];
  if (args.length === f.length) return f.apply(context, args);
  return function partial (a) {
    var args_copy = args.concat.apply(args, arguments);
    return pe(f, context, args_copy);
  }
}