array

Helpers for slices and Vecs that the standard library does not provide.

Inputs are borrowed slices and results are new Vecs: nothing is mutated. Membership-based helpers require Eq + Hash.

Install

Cargo feature array (enabled by default). To compile only this module:

cargo add helpers4 --no-default-features --features array

or in Cargo.toml:

[dependencies]
helpers4 = { version = "0.0.5", default-features = false, features = ["array"] }

Import path: helpers4::array.

Item	What it does
`cartesian_product`	Returns every pair `(x, y)` with `x` from `a` and `y` from `b`, in row-major order.
`count_by`	Counts the elements of `items` per key returned by `key`.
`difference`	Returns the elements of `a` that are not in `b`, in `a`’s order.
`duplicates`	Returns the elements that appear more than once in `items`, each one once, in the order they first appear.
`equals_unordered`	Returns `true` when `a` and `b` hold the same elements the same number of times, in any order.
`group_by`	Groups the elements of `items` by the key returned by `key`.
`interleave`	Alternates the elements of `a` and `b`, starting with `a`; the leftover of the longer slice goes at the end.
`intersection`	Returns the elements of `a` that also appear in `b`, in `a`’s order.
`intersects`	Returns `true` when `a` and `b` share at least one element.
`key_by`	Indexes the elements of `items` by the key returned by `key`.
`symmetric_difference`	Returns the elements present in exactly one of `a` and `b`.
`unique`	Removes duplicate values, keeping the first occurrence of each and the original order.
`unique_by`	Removes elements whose `key` was already seen, keeping the first of each key in order.