### 2.37.15 Concatenate two lists or a list and an element : `concat augment`

`concat` (or `augment`) takes as argument a list and an element or two lists.
`concat` (or `augment`) concats this list and this element, or concats these two lists.
Input :

`concat([3,4,2],[1,2,4])`

Or :

`augment([3,4,2],[1,2,4])`

Output :

`[3,4,2,1,2,4]`

Input :

`concat([3,4,2],5)`

Or :

`augment([3,4,2],5)`

Output :

`[3,4,2,5]`

Warning If you input :

`concat([[3,4,2]],[[1,2,4]]`

or

`augment([[3,4,2]],[[1,2,4]]`

the output will be:

`[[3,4,2,1,2,4]]`