An iterable is a sequence of values.
An array is a collection of values, stored contiguously.
An ES2015 spec-compliant `Array.prototype.copyWithin` shim/polyfill/replacement that works as far down as ES3.
Polyfill for Array.prototype.copyWithin
Copies part of array within.
Copies part of iterable within.
Counts occurrences of values.
Returns evenly spaced values within given interval.
Flattens nested array to given depth.
Rearranges values in arbitrary order.