Promises, pass additional parameters to then chain

Question

A promise, just for example:

var P = new Promise(function (resolve, reject) {
  var a = 5;
  if (a) {
    setTimeout(function(){
      resolve(a);
    }, 3000         


        

Answer 1

Use currying.

var P = new Promise(function (resolve, reject) {
    var a = 5;
    if (a) {
        setTimeout(function(){
            resolve(a);
        }, 3000);
    } else {
        reject(a);
    }
});

var curriedDoWork = function(text) {
    return function(data) {
        console.log(data + text);
    }
};

P.then(curriedDoWork('text'))
.catch(
    //some error handling
);