bim
A bidirectional map based on the ES6 Map object containing additional methods to retrive keys by values, delete key-value pairs by values and check the existence of keys by values. The module contains two classes: BiMap & WeakBiMap based on Map & WeakMap respectively.
Installation
npm install --save bim
Usage
Same as normal Map & WeakMap, plus the getKey, hasValue & deleteValue methods.
import { WeakBiMap } from 'bim'
// create objects to use as keys
const a = {
i: 'foo',
j: 8,
}
const b = {
k: 'bar',
p: 11,
}
// create the bidirectional weak map
const wbm = new WeakBiMap()
wbm.set(a, 5)
wbm.set(b, 6)
wbm.deleteValue(5) // now only has { k: 'bar', p: 11 } => 6
wbm.hasValue(5) // false
const c = {
h: 'quux',
z: 100,
}
wbm.set(c, 7)
wbm.hasValue(7) // true
wbm.getKey(7) // { h: 'quux', z: 100 }