Simple completion using function

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_mycompletion() {
    local command_name="$1" # not used in this example
    local current_word="$2"
    local previous_word="$3" # not used in this example
    # COMPREPLY is an array which has to be filled with the possible completions
    # compgen is used to filter matching completions
    COMPREPLY=( $(compgen -W 'hello world' -- "$current_word") )
}    
complete -F _mycompletion mycommand

Usage Example:

$ mycommand [TAB][TAB]
hello world
$ mycommand h[TAB][TAB]
$ mycommand hello

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