---
name: "Array.elem"
section: "3kaya"
platform: "linux"
package: "kaya"
version: "0.4.4-6.2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/Array.elem"
---

# Array.elem(3kaya)

Check whether a value is in a list.

## NAME

Array::elem - Check whether a value is in a list.

## SYNOPSIS

**Bool elem(** *a val, \[a\] list, Bool(a, a) eq=equal* **)**

## ARGUMENTS

**val** The value to search for ("needle")

**list** The list to search ("haystack")

**eq** Optionally, the function used to check for presence (the default is **Builtins.equal (3kaya)** , obviously, but **Builtins.identical (3kaya)** might be used)

## DESCRIPTION

Check whether the "needle" occurs at least once in the "haystack". This function can be thought of as a specialised version of **Array.any (3kaya)**

## AUTHORS

Kaya standard library by Edwin Brady, Chris Morris and others (kaya@kayalang.org). For further information see http://kayalang.org/

## LICENSE

The Kaya standard library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License (version 2.1 or any later version) as published by the Free Software Foundation.

## RELATED

**Array.any (3kaya)**

**Builtins.equal (3kaya)**

**Builtins.identical (3kaya)**