.then() and .catch() semantic comparison

index.js

var when = require('when');


var B = when(777);

// Using the .catch after .then
B.then(function(result) {
  throw "There was an error in our function!";
})
.catch(function(err) {
  console.log(err);
})


// Using the second parameter of .then()
var C = when(777);

C.then(function(result){
  throw "Yeah there was an error in here.";
}, function(err) {
  console.log(err);
})


// Using .catch before .then
var D = when(777);

D.catch(function(err){
  console.log(err);
})
.then(function(result){
  throw "There was a big time error right here."
});

package.json

{
  "name": "promises_test",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "when": "^3.7.3"
  }
}