list_ex

#!/bin/bash
#
# Example that corresponds to https://go.dev/play/p/9JuKIGdWlpF from
# the go documentation.

readonly DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
. ${DIR}/../../gobash


function main() {
        local l
        l=$(container_List) || \
                { ctx_w "cannot make a list"; return $EC; }

        local e4
        e4=$($l push_back 4) || \
                { ctx_w "cannot push 4"; return $EC; }

        local e1
        e1=$($l push_front 1) || \
                { ctx_w "cannot push 1"; return $EC; }

        $l insert_before 3 "$e4" > /dev/null || return $EC
        $l insert_after 2 "$e1" > /dev/null || return $EC

        local e=$($l front)
        while [ "$e" != "$NULL" ]; do
                echo "$($e value)"
                e=$($e next) || return $EC
        done
}

ctx_clear
main || ctx_show