arguard

Function argument validator.

Throws an error if the argument being tested is of wrong type or doesn't meet specified criteria.

Usage

var arguard = require('arguard');

function foo(bar, baz, options){
	arguard.number(bar, 'bar');
	arguard.string(baz, 'baz').oneOf(['local', 'remote']);
	arguard.object(options, arguard.names.options);
}

API

Function	Throws errof if
bool(arg, argName)	typeof arg !== 'boolean'
object(arg, argName)	typeof arg !== 'object' OR !arg
array(arg, argName)	!Array.isArray(arg)
func(arg, argName)	typeof arg !== 'function'
number(arg, argName)	typeof arg !== 'number' OR Number.isNaN(arg)
number(arg, argName).positive()	as above AND arg <= 0
string(arg, argName)	typeof arg !== 'string'
string(arg, argName).oneOf(['str1', 'str2'])	as above AND (arg != 'str1' AND arg != 'str2')
string(arg, argName).nonempty()	typeof arg !== 'string' AND arg !== ''

arguard.maybe.number(..), arguard.maybe.string(..), arguard.maybe.bool(..), arguard.maybe.func(..) allow first argument to be undefined but otherwise behave as specified above.

arguard.names is an object with 3 keys, which holds strings for common arguments names:

{
	params: 'params',
	options: 'options',
	cb: 'cb'
}

Similar module: aproba