Basic simple to understand how to pass a default value for a required functional argument

default-value-argument-as-function.js

const { log } = console;

const run = (a) => `${a} - Run`

const dance = b => `${b} - Dance`

const defaultAction = c => `${c} - Can do all things :)`

const human = (action = defaultAction) => action('A human can')

log(human()) // A human can - Can do all things :)
log(human(run)) // A human can - Run
log(human(dance)) // A human can - Dance