Functional Programming Development Tutorials, Guides & Insights

Lazy loading defers the loading of non-critical resources at the initial page load, improving performance by reducing the amount of data that needs to be loaded upfront.

• Images: Use the loading="lazy" attribute to lazy load images.

<table>
  <tr>
    <th>Function</th>
    <th>Description</th>
    <th>Example</th>
  </tr>
  <tr>
    <td><code>_.each(list, iteratee)
    Iterates over a list, invoking the iteratee for each element.
    _.each([1, 2, 3], alert)
  
  
    _.map(list, iteratee)
    Creates a new array by applying the iteratee to each element in the list.
    _.map([1, 2, 3], num => num * 3) => [3, 6, 9]
  
  
    _.reduce(list, iteratee, memo)
    Reduces a list to a single value by iterating and combining elements.
    _.reduce([1, 2, 3], (sum, num) => sum + num, 0) => 6
  
  
    _.filter(list, predicate)
    Returns an array of elements that pass a truth test.
    _.filter([1, 2, 3, 4], num => num % 2 == 0) => [2, 4]
  
  
    _.findWhere(list, properties)
    Returns the first element that matches the specified properties.
    _.findWhere([{a: 1}, {a: 2}], {a: 2}) => {a: 2}
  

Moment.js is a popular library for parsing, validating, manipulating, and formatting dates in JavaScript.