Remove elements of a list : remove

### 2.37.22 Remove elements of a list : `remove`

`remove` takes as argument : a boolean function `f` and a list `L`.
`remove` removes in the list `L`, the elements `c` such that `f(c)==true`.
Input :

`remove(x->(x>=2),[0,1,2,3,1,5])`

Output :

`[0,1,1]`

Remark The same applies on strings, for example, to remove all the "a" of a string:
Input :

`ord("a")`

Output :

`97`

Input :

    f(chn):={
      local l:=length(chn)-1;
      return remove(x->(ord(x)==97),seq(chn[k],k,0,l));
    }

Then, input :

`f("abracadabra")`

Output :

`["b","r","c","d","b","r"]`

To get a string, input :

`char(ord(["b","r","c","d","b","r"])`

Output :

`"brcdbr"`