promise-toolbox/catch.js

Essential utils for promises

"use strict";

const matchError = require("./_matchError");

function handler(predicates, cb, reason) {
  return matchError(predicates, reason) ? cb(reason) : this;
}

module.exports = function pCatch() {
  let n = arguments.length;
  let cb;

  if (n === 0 || typeof (cb = arguments[--n]) !== "function") {
    return this;
  }

  return this.then(undefined, handler.bind(this, n === 0 ? undefined : n === 1 ? arguments[0] : Array.prototype.slice.call(arguments, 0, n), cb));
};