Category: JavaScript

Declare reusable behavior with function declarations and expressions.

Define parameters, defaults, and rest parameters.

Send values out of functions with return.

Store functions in variables as expressions.

Use includes, slice, split, replace, trim, and case helpers.

Build multi-line interpolated strings with backticks.

Store ordered lists with arrays and index access.

Transform data with map, filter, reduce, find, some, and every.

Model entities with key/value objects.

Use Object.keys/values/entries, assign, and freeze helpers.