wassat

(What's that?)

Installation and Usage

npm install wassat

var wassat = require('wassat');

API

wassat(Object anything) -> String

The main function accepts anything and returns a string. The result is an all-lowercase version of the basic JavaScript "class" of which the object is an instance. If it's an instance of something else (HTMLElement for example, or perhaps the Math object), it returns "object". Under the hood, wassat uses Object.prototype.toString. For null and undefined, wassat() uses strict equality.

• wassat('abc') -> 'string'
• wassat(123) -> 'number'
• wassat(NaN) -> 'number'
• wassat(true) -> 'boolean'
• wassat({}) -> 'object'
• wassat([]) -> 'array'
• wassat(function(){}) -> 'function'
• wassat(new Date()) -> 'date'
• wassat(new RegExp()) -> 'regexp'
• wassat(new Error()) -> 'error'
• wassat((function(){return arguments})()) -> 'arguments'
• wassat(document.querySelector('div')) -> 'object'
• wassat(null) -> 'null'
• wassat(undefined) -> 'undefined'

.is methods

There is a corresponding "is" method for each type, as follows:

wassat.isString([Object anything]) -> Boolean

true if wassat(anything) === 'string', else false

wassat.isNumber([Object anything]) -> Boolean

true if wassat(anything) === 'number', else false

Note: Returns true for NaN

wassat.isBoolean(Object anything) -> Boolean

true if wassat(anything) === 'boolean', else false

wassat.isArray(Object anything) -> Boolean

true if wassat(anything) === 'array', else false

wassat.isObject(Object anything) -> Boolean

true if wassat(anything) === 'object', else false

wassat.isFunction(Object anything) -> Boolean

true if wassat(anything) === 'function', else false

wassat.isDate(Object anything) -> Boolean

true if wassat(anything) === 'date', else false

wassat.isRegExp(Object anything) -> Boolean

true if wassat(anything) === 'regexp', else false

wassat.isError(Object anything) -> Boolean

true if wassat(anything) === 'error', else false

wassat.isArguments(Object anything) -> Boolean

true if wassat(anything) === 'arguments', else false

wassat.isNull(Object anything) -> Boolean

true if wassat(anything) === 'null', else false

wassat.isUndefined(Object anything) -> Boolean

true if wassat(anything) === 'undefined', else false

Other Methods

wassat.isNil(Object anything) -> Boolean

true if wassat(anything) === 'null' or wassat(anything) === 'undefined'

wassat.isPrimitive(Object anything) -> Boolean

true if anything is of a primitive type (string, number, boolean). Primitive types can't hold properties. Not yet tested with ES6 Symbols.

wassat.isIt(Function ctor, Object anything) -> Boolean

Uses instanceof to check if ctor's prototype is in anything's prototype chain. Performs a little check for primitives so it can handle those too (since "abc" instanceof String is false).

wassat.isItExactly(Function ctor, Object anything) -> Boolean

Compares the prototype of anything (via Object.getPrototypeOf) to the value of ctor.prototype to see if ctor is the constructor function of anything. Performs a little check for primitives so it can handle those too (since Object.getPrototypeOf("abc") throws).

wassat.isAll(String type, Array iterable) -> Boolean

For each item in iterable, returns false if wassat(item) isn't type. Else true.