# is not

- [isNotBoolean()](/is-not/isnotboolean.md)
- [isNotDefined()](/is-not/isnotdefined.md)
- [isNotFunction()](/is-not/isnotfunction.md)
- [isNotNull()](/is-not/isnotnull.md)
- [isNotNumber()](/is-not/isnotnumber.md)
- [isNotString()](/is-not/isnotstring.md)
- [isNotUndefined()](/is-not/isnotundefined.md)