Function of

Creates a new Map from alternating keys and values

const { Map } = require('immutable')
Map.of(
  'key', 'value',
  'numerical value', 3,
   0, 'numerical key'
)
// Map { 0: "numerical key", "key": "value", "numerical value": 3 }

Deprecated

Use Map([ [ 'k', 'v' ] ]) or Map({ k: 'v' })