R: Check if an Object is Element of a List

has_element {mlr3misc} | R Documentation

## Check if an Object is Element of a List

### Description

Simply checks if a list contains a given object.

- NB1: Objects are compared with identity.

- NB2: Only use this on lists with complex objects, for simpler structures there are faster operations.

- NB3: Clones of R6 objects are not detected.

### Usage

    has_element(.x, .y)

### Arguments

`.x` | (`list()` | atomic `vector()`).
`.y` | (`any`) Object to test for.

### Examples

    has_element(list(1, 2, 3), 1)

[Package mlr3misc version 0.8.0 Index]