References

summary
public	F isArray(x: *)
public	F isBoolean(x: *)
public	F isDate(x: *)
public	F isFinite(x: *)
public	F isFunction(value: *)
public	F isInstance(type: , x: ): *
public	F isInt(x: *)
public	F isInt32(x: *)
public	F isNaN(x: *)
public	F isNegativeInfinity(x: *)
public	F isNull(x: *)
public	F isNumber(x: *)
public	F isObject(x: *)
public	F isPositiveInfinity(x: *)
public	F isRegExp(x: *)
public	F isString(x: *)
public	F isUndefined(x: *)