type-predicates

Functions for checking types of values.

API

Most of these should be self-explanatory:

#### isString(thing)

#### isNumber(thing)

#### isInteger(thing)

isNumber(thing) && ((thing | 0) === (0 + thing))

#### isBoolean(thing)

#### isArray(thing)

#### isFunction(thing)

#### isNull(thing)

#### isNotNull(thing)

#### isObject(thing)

Use this to check for any non-null object, including arrays or wrapped primitives.

(typeof thing === 'object') && (thing !== null)

#### isPlainObject(thing)

Matches any non-null objects excluding arrays.

isObject(thing) && !Array.isArray(thing)

#### isPlainObjectStrict(thing)

As isPlainObject(thing), but also excludes wrapped primitives.

#### isDefined(thing)

#### isUndefined(thing)

#### exists(thing)

isNotNull(thing) && isDefined(thing)