A JavaScript timer which triggers a callback at a constant interval.

clock.js

async function clock(actions, timeout) {
    start = performance.now()
    for (let i = 0; i < actions.length; i++) {
        await actions[i]()
    }
    return setTimeout(clock.bind(clock, actions, timeout), timeout - (performance.now() - start))
}
clock(new Array(3).fill(undefined).map((_, i) => () => {
    console.log(i, performance.now())
    return new Promise(res => setTimeout(res, 500))
}), 3000)