Package Exports

stdopt
stdopt/opt

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (stdopt) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

stdopt

Wrap and validate optional values

Usage

This package provides wrappers to check inputs and provide fallbacks. There is a general some wrapper to check if a value is defined or not, as well as a handful of others for various primitives. The chained syntax is more verbose than the standard JS way (i.e. var str = opts.str || 'default'), but it is more solid and predictable.

var { some } = require('stdopt')
some('some data').value() // => 'some data'
some(null).or('other data').value() // => 'other data'
some(null).or(undefined).value() // => throws error

// string primitive
var { string } = require('stdopt')
string('some text').value() // => 'some text'
string(true).or('other text').value() // => 'other text'
string(5).value() // => '5'

// number primitive
var { number } = require('stdopt')
number(5).value() // => 5
number(true).or(7).value() // => 7
number('11').value() // => 11

// boolean primitive
var { boolean } = require('stdopt')
boolean(false).value() // => false
boolean(null).or(true).value() // => true
boolean('True').value() // => true
boolean('fAlSe').value() // => false

// hash primitive
var { hash } = require('stdopt')
hash({stuff: true}).value() // => {stuff: true}
hash(true).or({other: false}).value() // => {other: false}
hash([1, 2, 3]).value() // => throws error

// list primitive
var { list } = require('stdopt')
list([1, 2, 3]).value() // => [1, 2, 3]
list('one').value() // => ['one']
list(null).or([4, 5, 6]).value() // => [4, 5, 6]
list({0: 'stuff', length: 1}).value() // => ['stuff']

Custom

You can also create your own custom primitives, by using the Opt class and defining a custom static parse method.

var Opt = require('stdopt')

function lowercase (value) {
  if (!(this instanceof lowercase)) {
    return new lowercase(value)
  }
  Opt.call(this, value)
}

lowercase.parse = function (value) {
  if (typeof value === 'string' && value.toLowerCase() === value) {
    return value.toLowerCase()
  }
}

lowercase('oh.').value() // => 'oh.'
lowercase('AHA!').or('oh.').value() // => 'oh.'
lowercase('AHA!').value() // => throws error

License

Apache-2.0