Answers the question: "can this value have keys?". Returns true if a value is any of the object types: array, regexp, plain object, function or date. Useful for determining if a value is an object that can be extended.
Pass two numbers, get a regex-compatible source string for matching ranges. Fast compiler, optimized regex, and validated against more than 2.78 million test assertions. Useful for creating regular expressions to validate numbers, ranges, years, etc.
Recursively (deep) clone JavaScript native types, like Object, Array, RegExp, Date as well as primitives. Used by superstruct, merge-deep, and many others!