test-rxdb
Version:
A local realtime NoSQL Database for JavaScript applications -
35 lines (34 loc) • 1.24 kB
JavaScript
/**
* Returns the current unix time in milliseconds (with two decimals!)
* Because the accuracy of getTime() in javascript is bad,
* and we cannot rely on performance.now() on all platforms,
* this method implements a way to never return the same value twice.
* This ensures that when now() is called often, we do not loose the information
* about which call came first and which came after.
*
* We had to move from having no decimals, to having two decimal
* because it turned out that some storages are such fast that
* calling this method too often would return 'the future'.
*/
var _lastNow = 0;
/**
* Returns the current time in milliseconds,
* also ensures to not return the same value twice.
*/
export function now() {
var ret = Date.now();
ret = ret + 0.01;
if (ret <= _lastNow) {
ret = _lastNow + 0.01;
}
/**
* Strip the returned number to max two decimals.
* In theory we would not need this but
* in practice JavaScript has no such good number precision
* so rounding errors could add another decimal place.
*/
var twoDecimals = parseFloat(ret.toFixed(2));
_lastNow = twoDecimals;
return twoDecimals;
}
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