Check.js

Checkjs is a minimal, easy to write, easy to read type checking JavaScript library with a grammar similar to shouldjs. The basic purpos of this API is to make type checking in JavaScript easier, and more readable. Ever wrote lines like this?

function createComponent(jsonObj) {
  var product = jsonObj && jsonObj.products && isArray(jsonObj.products) && typeof jsonObj.products[0] === 'string';

  if (product) {
    handleProduct(jsonObj.products[0].toLowerCase());
  }
}

It's a really simple example where checkjs could be handy.

check.js

function createComponent(jsonObj) {
  if (check(jsonObj).is.object().and.have('products').which.is.array()) {
    handleProduct(jsonObj.products[0].toLowerCase());
  }
}

Note: you can pass multiple arguments to check(). ;)

Under Development

Usage

You need to wrap your values with the ckeck method to create a Cheak instance.

Grammar elements:

In the API there are class properties which are present only to read your tests easier. These are unfunctional.

a
an
and
all
be
have
if
is
isAll
it
of
the
toBe
which
with

Example

check(1).if.it.is.a.number()

Although you can write expressions like these, i do not recommend this, because this much (dots) can be easily confusing.

check(1).if.number()

I recommend only to write one glue word between the check, and the type function.

Negation elements

There are currently 3 negation elements, which will negate the result.

not
notAll
notToBe