A "2D array" is the name we commonly use to describe a array of arrays. An associate array is another name for a "Object" in JavaScript but objects can do more than store keys and values. A map is ...

Learn how JavaScript’s built-in functions like map() and filter(), as well as compose() and chain(), support a more elegant handling of JavaScript arrays.

The proposal provides a complete way of constructing data, in the required dictionary type (map or object), from arrays and other iterables, from a very terse way in the most common types of use cases ...

The Map object in JavaScript provides several key methods for adding, retrieving and manipulating key-value pairs. ... as they outperform objects in these cases. Set vs. 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.