This function outputs the value 22. When to use JavaScript’s reducer The reduce method provides a unique way to iterate through items in an array and process them.

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.

There are some advantages to using JavaScript, though, not in the least its popularity and ability to easily connect to third-party services, but also the simple fact that these functions can run ...