Functional Programming Development Tutorials, Guides & Insights

While Promises improved the readability of asynchronous code, async and await take it a step further by allowing developers to write asynchronous code that looks synchronous.

The async keyword is used to declare a function as asynchronous. Inside an async function, you can use the await keyword to pause the execution of the function until a Promise is resolved.

<table>
  <tr>
    <th>Function</th>
    <th>Description</th>
    <th>Example</th>
  </tr>
  <tr>
    <td><code>R.compose(...functions)
    Composes functions from right to left.
    R.compose(Math.abs, R.add(1))(-5) => 4
  
  
    R.curry(fn)
    Returns a curried version of the provided function.
    R.curry((a, b) => a + b)(1)(2) => 3
  
  
    R.filter(predicate, list)
    Returns a new list containing only the elements that satisfy the predicate.
    R.filter(x => x % 2 === 0, [1, 2, 3, 4]) => [2, 4]
  
  
    R.map(fn, list)
    Applies the function to each element of the list.
    R.map(x => x * 2, [1, 2, 3]) => [2, 4, 6]
  
  
    R.reduce(reducer, initialValue, list)
    Reduces the list to a single value using the reducer function.
    R.reduce(R.add, 0, [1, 2, 3]) => 6
  

Date-fns is a modern JavaScript date utility library that provides over 200 functions for manipulating dates without modifying native JavaScript objects.