npm install typr``
T = [Function, Object, Date, Number, String, Boolean, RegExp, Undefined, Arguments, Null, Array]
Prop. 1 For every JS object x, x has exactly one type in T where [typr] returns true for its typecheck.
Prop. 2 Whether or not an Object has keys and can be looped over is determined by t.hasKeys and is completely independent of the type found in prop 1.
Prop. 3 Number types can be partitioned into 3 sub-types:
- isNaN
- isInfinite
- isNumeric i.e. !isNaN && !isInfinite
These properties are tested extensively.
`javascript`
var typr = require('typr');
typr.isFunction(el); // true iff el is a function
Read the very short API.
A common trick in node modules to export a function, but additionally attach
properties to it. Such an object will only be a Function by our partitioning
(as that was its original construction), but it is Object-like.
If you would rather test for enumerability of properties, use the extra test for Object-likeness: hasKeys.
Note again that this may not be super intuitive:
`javascript
var dualThing = new String("wee");
dualThing.prop = "hi";
Object.keys(dualThing); // [ '0', '1', '2', 'prop' ]
t.isObject(dualThing); // false
t.isString(dualThing); // true
t.hasKeys(dualThing); // true
`
`bash`
$ npm install typr
`bash`
$ npm install
Run the tests
`bash``
$ npm test