isObject_.isObject(value) Returns true if value is an Object. Note that JavaScript arrays and functions are objects
isNumber_.isNumber(object) Returns true if object is a Number (including NaN).
isNaN_.isNaN(object) Returns true if object is NaN. Note: this is not the same as the native isNaN
has_.has(object, key) Does the object contain the given key? Identical to object.hasOwnProperty(key), but uses a safe reference
isNull_.isNull(object) Returns true if the value of object is null.
isArray_.isArray(object) Returns true if object is an Array.
invert_.invert(object) Returns a copy of the object where the keys have become the values and the values the keys. For this
isError_.isError(object) Returns true if object inherits from an Error.
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