...functions- Any number of functions.
Performs left-to-right function composition. The first argument to a pipeline acts as the initial value, and is transformed as it passes through each function.
const pipe = (...functions) => (initialValue) =>…
What’s the difference between a framework and library? I’ve had this discussion with developers at work and meetups, and the core idea boils down to this.
You tell libraries what to do, frameworks tell you what to do.
Generally speaking a framework tells you what to do. It has a “right way” of doing things and provides tooling to support you.
These are frameworks created by dedicated teams, and ship with everything you need to build large-scale applications.
In my last article I offered you a challenge to recreate well-known functions using
reduce. This article will show you how some of them can be implemented, along with some extras!
In total we’re going to look at ten utility functions. They’re incredibly handy on your projects, and best of all, they’re implemented using
reduce! I drew lots of inspiration from the RamdaJS library for this one, so check that out!
predicate- Function that returns
array- List of items to test.
true for any item,
true. Otherwise it returns
If you’re new to Redux, consider reading the official docs first.
Consider this simple counter application that uses the Redux architecture. If you’d like to jump ahead check out the Github repo for it.
reduce is one of the toughest concepts to crack. In this article I’ll try to address one core question…
reduceand why is it called that?
Some of them, according to Wikipedia, are
They all hint at the core idea. It’s all about breaking a structure down into a single value.
Reduce — A function that folds a list into any data type.
It’s like folding a box! With
reduce you can turn an array
[1,2,3,4,5] into the number
15 by adding them all up.
Yet many developers, regardless of experience, frantically ask: “Which project should I do?”
I can’t even begin to count how many people (myself very much included) keep saying
I’m buying and reading this book!
I’ve started building this app to learn React and GraphQL!
Ever since ES6 dropped, this has been the most popular method. It’s a brief syntax and you’ll find it incredibly useful when using libraries like React and Redux.
numbers = [1, 2, 3];
numbersCopy = [...numbers];
Note: This doesn’t safely copy multi-dimensional arrays. Array/object values are copied by reference instead of by value.
This is fine
// [1, 2, 3] and [1, 2, 3, 4]
// numbers is left alone
This is not fine