true-map

true-map

A true string -> value mapping datatype

Why

Thanks to __proto__, you can no longer add arbitrary strings as object keys without fear of malfunctioning in modern browsers; even in objects created via Object.create(null). true-map solves that; providing a storage datatype with that intact.

Example

var map = require('true-map')

var person = map({ firstName: 'hugh', lastName: 'jackson' })

person.has('firstName') //= true
person.set({ 
    awesome            : 'hopefully',
    feelingChristmassy : true
})

person.get('awesome') //= "hopefully"

API

map([Object])

Creates an empty map, or sets the initial attributes if an object is passed.

var o = map()

// or
var you = map({ wise: true, willUseThisLib: true })

.set(String, Value) OR .set(Object)

Sets an attribute, or shallow-clones an object's attributes to the map.

var o = map()

o.set('x', 3) 
o.set({ y: 4, z: 5 })

o.has('x') //= true

.get

Gets an attribute.

var o = map({ x: 3, y: 4 })

o.get('x') //= 3

.has(String)

Returns true or false; same as key in object for regular objects:

var o = map({ x: 3, y: 4 })

o.has('x') //= true
o.has('z') //= false

.remove(String)

Removes an attribute - same as delete, but it returns the map itself to allow chaining (there are no non-deletable attributes, so returning true or false is unnecessary)

var o = map({ 
    foo: 'bar',
    baz: 'quux'
})

o.remove('foo').remove('baz')
o.has('foo') //= false

.attributes

Where the attributes themselves are stored, with the keys prefixed with '$' to ensure no collision with 'dunder' properties, such as __proto__.

Install

npm install true-map or download Creates a CommonJS module if available, otherwise exports a global named tap.