sequentialPromisesWorkSequentially.js

var x = function() {
  return new Promise ((resolve,reject) => {
    console.log("performing x");
    setTimeout(() => {
      resolve(10)
    }, 2000)
  })
}
var y = function() {
  return new Promise ((resolve,reject) => {
    console.log("performing y");
    setTimeout(() => {
      resolve(2)
    }, 2000)
  })
};
var z = function() {

  return new Promise ((resolve,reject) => {
    console.log("performing z");
    setTimeout(() => {
      resolve(3)
    }, 2000)
  })
};

var list = [x,y,z];

list.reduce((p, c) => {
  return p.then((val) => {
    console.log("intermediate val:", val);
    return c()
  })
}, Promise.resolve(0))
.then((val) => {
  console.log("final value:", val)
})
//intermediate val: 0
//performing x
//intermediate val: 10
//performing y
//intermediate val: 2
//performing z
//final value: 3