PromiseCatchOrThenFirst.js

// Catch function before then function
var a = Promise.reject('ErrorValue')
    .catch((err) => {
        console.log('Catch', 'PromiseValue', err)
    })
    .then((data) => {
        console.log('Then', 'PromiseValue', data)
    })

// Then function before catch function
var b = Promise.reject('ErrorValue')
    .then((data) => {
        console.log('Then', 'PromiseValue', data)
    })
    .catch((err) => {
        console.log('Catch', 'PromiseValue', err)
    })

// Return new promise value
var c = Promise.reject('ErrorValue')
    .catch((err) => {
        console.log('Catch', 'PromiseValue', err)
        return 'NewPromiseValue'
    })
    .then((data) => {
        console.log('Then', 'PromiseValue', data)
    })

// Return new promise
var d = Promise.reject('ErrorValue')
    .catch((err) => {
        console.log('Catch', 'PromiseValue', err)
        return Promise.resolve('ResolvedValue')
    })
    .then((data) => {
        console.log('Then', 'PromiseValue', data)
    })

// Multiple then functions
var e = Promise.reject('ErrorValue')
    .catch((err) => {
        console.log('Catch', 'PromiseValue', err)
        return Promise.resolve('ResolvedValue')
    })
    .then((data) => {
        console.log('Then1', 'PromiseValue', data)
    })
    .then((data) => {
        console.log('Then2', 'PromiseValue', data)
    })
    .then((data) => {
        console.log('Then3', 'PromiseValue', data)
    })