Function elapsedSince

Returns elapsed time since the initial call.

// Record start
const elapsed = elapsedSince();

// Get elapsed time in millis
// since Elapsed.since()
elapsed(); // Yields number
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If you want to initialise a stopwatch, but not yet start it, consider:

// Init
let state = {
 sinceClicked: elapsedInfinity()
};

state.sinceClicked(); // Returns a giant value

// Later, when click happens:
document.addEventListener('click', () => {
 state.sinceClicked = elapsedSince();
});

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The skip option allows you to skip the first N calls to the returned function before starting the timer. For example, if you want to skip the first 2 calls:

const elapsed = elapsedSince({ skip: 2 });

elapsed(); // First call, timer not started yet. Get NaN
elapsed(); // Second call, timer still not started. Get NaN
elapsed(); // Third call, returns elapsed time since last `elapsed()` call.
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See also: elapsedOnce if you want to measure a single period, and stop it. elapsedInterval time between calls