function-accessor

Higher-Order accessor functions.

npm install function-accessor --save

You can also use Duo, Bower or download the files manually.

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Usage

var accessor = require('function-accessor')

Features

• Automatic method chaining on object setters.
• Initial (default) value support.
• Input validation on setters.
• Read-only getter support.

API

accessor()

var assert = require('assert')

var latitude = accessor()

latitude(32.7229)
assert.equal(latitude(), 32.7229)
//=> undefined

latitude(45.49428)
assert.equal(latitude(), 45.49428)
//=> undefined

accessor({ init: … })

var assert = require('assert')

var latitude = accessor({
  init: 32.7229
})

assert.equal(latitude(), 32.7229)
//=> undefined

latitude(45.49428)
assert.equal(latitude(), 45.49428)
//=> undefined

accessor({ check: Function })

var assert = require('assert')
var isNumber = require('util').isNumber

var latitude = accessor({
  check: isNumber
})

latitude(45.49428)
assert.equal(latitude(), 45.49428)
//=> undefined

latitude('this is not a number!!')
//=> RangeError

accessor({ check: RegExp })

var assert = require('assert')

var pin = accessor({
  check: /^\d{4}$/
})

latitude(1234)
assert.equal(pin(), 1234)
//=> undefined

pin('123')
//=> RangeError

accessor({ readonly: true })

var latitude = accessor({
  init: 32.7229,
  readonly: true
})

assert.equal(latitude(), 32.7229)
//=> undefined

latitude(45.49428)
//=> TypeError

accessor({ self: this })

var assert = require('assert')

var address = {
  street: accessor({
    self: address
  }),

  city: accessor({
    self: address
  }),

  state: accessor({
    self: address
  }),

  zip: accessor({
    self: address
  }),

  country: accessor({
    self: address
  })
}

address
  .street('200 E Main Street')
  .city('Phoenix')
  .state('AZ')
  .zip('85123')
  .country('USA')

assert.equal(address.country(), 'USA')
//=> undefined

Contributing

SEE: contributing.md

Alternatives / Inspiration

• Object.defineProperty
• getter
• setter
• component-model
• component-attr
• attr

Licenses