32. Add a new property to your penguin called favoriteFoods and set it equal to an array containing a list of three strings. 33. Access your penguin's second favorite food and print it to the console ...

The Array Object in JavaScript has a built-in reduce method that iterates over each value in an array and returns a value. It is very useful when calculating sums. Write a function that takes an array ...

Use popular 'grammar of data' syntax to filter and subset your two-dimensional JavaScript arrays and more. Here's how to use Arquero for data wrangling in Observable JavaScript and Node.js.

Get tips for instantiating JavaScript's prototype-based objects two ways: via constructor functions or object initialization.