array-of-truths

Ensure your input becomes an Array, and keep only the truthy values.

API

This module exports one function that holds another function:

arrayOfTruths(x)

If x is not an array, it will be treated as an array with x as the only item. Return a new Array that contains the truthy items from x.

.ifAny(x)

Like arrayOfTruths(x) but if there are no truthy items, instead of an empty array, return number 0.

.ifAnyMap(x, m)

Map a list x through one or more mapper functions m (function or array of functions), except initially and also after each step, false-y items are removed from the list. If the list would be empty, return number 0 instead.

.listAdd(o, k, v)

Replace o[k] with an array that contains:

1. The truthy old value(s), if o had an "own" property named k. See usage test for caveats.
2. v if it is truthy.

Returns that new array.

Usage

see test/usage.mjs.

Known issues

• I find the package name tricky to pronounce.

 

License

ISC