index.js
function parameters (spec) {
  var defs = {}
  var envs = {}

  return function (params) {
    init(spec, defs, envs)
    var opts = cat(defs, envs, params)
    var errs = []

    def(opts, spec, errs)
    req(opts, spec, errs)
    val(opts, spec, errs)

    return {
      error: errs.length ? errs[0] : null,
      errors: errs,
      params: opts
    }
  }
}
function parameters (spec) {
  var defs = {}
  var envs = {}

  return function (params) {
    init(spec, defs, envs)
    var opts = cat(defs, envs, params)
    var errs = []

    def(opts, spec, errs)
    req(opts, spec, errs)
    val(opts, spec, errs)

    return {
      error: errs.length ? errs[0] : null,
      errors: errs,
      params: opts
    }
  }
}
function parameters ( spec ) { var defs = { } var envs = { } return function ( params ) { init ( spec , defs , envs ) var opts = cat ( defs , envs , params ) var errs = [ ] def ( opts , spec , errs ) req ( opts , spec , errs ) val ( opts , spec , errs ) return { error : errs . length ? errs [ 0 ] : null , errors : errs , params : opts } } }
Named parameters supporting default value, validation, and environment variables.

@param {String} string
string literal.

@return {String}
string literal.
Named parameters supporting default value validation and environment variables .