Function perSecond

Returns a proportion of amount depending on elapsed time. Cumulatively, amount is yielded every second.

// Calculate a proportion of 0.1 every second
const x = perSecond(0.1);
x();
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The faster x() is called, the smaller the chunks of amount are returned. Values accumulate. For example, x() isn't called for two seconds, 2*amount is returned.

Example: Usage

const settings = {
 ageMod: perSecond(0.1);
};

let state = {
 age: 1
};

// Update
setInterval(() => {
 let { age } = state;
 // Add 0.1 per second, regardless of 
 // loop speed
 age += settings.ageMod(); 
 state = {
   ...state,
   age: clamp(age)
 }
});
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Use the clamp option so the returned value never exceeds amount. Alternatively, min/max options allow you to set arbitrary limits.