Andrei Fidelman
const jsDeveloper = !!!(+[] - +[]);
Why use flow?
Type checking
Static Typisation
dynamic Typisation
Error handling on compilation phase
Error handling on running phase (runtime error)
You can proactively find bugs and errors
Why use flow?
Self-documentation
You do not need jsdoc
// @flow
function calculatePayoutDate(
quote: boolean,
amount: number,
paymentMethod: string): Date {
let payoutDate;
/* business logic */
return payoutDate;
}/*
@function Determines the payout date for a purchase
@param {boolean} quote - Is this for a price quote?
@param {boolean} amount - Purchase amount
@param {string} paymentMethod -
Type of payment method used for this purchase
*/
function calculatePayoutDate(quote, amount, paymentMethod) {
let payoutDate;
/* .... Business logic .... */
return payoutDate;
};Why use flow?
and more
confident to carry out the refactoring
easy integration to a project
active development team (Facebook, 30 commits everyday)
IDE integration
reduce amount of unit tests
Why not use flow?
you need to learn API
write more code x2, x3
delay development phase
spend time to be a master
When use flow?
very important for you business (maintainable, scalable)
there is a development team
the architecture is complicated and has many features
will be refactored to follow tech trends
When not use flow?
the program is short-lived and critically unimportant
you are alone developer
the app is easy and small
the app is a prototype
What to do to start to use flow?
Implement to a project/growing project
create npm scripts to check
integrate with IDE
include presets
not necessary to connect with a watcher
you have 3 weeks 😊
write at least 1 component
installation
flowjs
By Andrei Fidelman
