vsize

Counts the elements in an Array, Map, Object, Set, or other collection.

Installation

Requires Node.js 6.0.0 or above.

npm i vsize

API

The module exports a single function.

Parameters

1. Bindable: collection (Array, iterable, Map, Object, Set, string, or Typed Array): The collection whose elements you want to count.
2. Optional: Object argument:
   • arrays / maps / sets (arrays of classes/strings): Arrays of classes and/or string names of classes that should be treated as equivalent to Array/Map/Set (respectively).
   • ducktype (boolean): Whether or not to support unrecognized collection types that have a size or length property. Defaults to false.
   • inObj (boolean): Whether or not to include inherited properties if collection is an Object (i.e. not another recognized type). Defaults to false.
   • reflectObj (boolean): Whether or not to use reflection to include non-enumerable Object properties. Only takes effect if collection is an Object (i.e. not another recognized type). Defaults to false.

Return Value

The number of items in the collection.

Example

const size = require('vsize')

size([]) // 0
size({a: 1, b: 2}) // 2
size('test') // 4
size(new Map([['key', 'value']])) // 1

Related

The “k” family of modules works on keyed/indexed collections.

• khas
• kget
• kedit
• kset
• kinc
• kdel

The “v” family of modules works on any collection of values.

• vhas
• vget
• vadd
• vdel