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GeezerVison is showing github.com — JavaScript/Timing-Functions/IntervalTimer.js at master · TheAlgorithms/JavaScript

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/**
* @author Nandan V
* Sunday, 26 July 2020 8:33 AM
* @description Singleton class that handles the <b>timing of tests</b> and
* specs. <br/> The class is singleton as <u>javascript does not support
* multiple timer instances<u/>.
*/
class IntervalTimer {
/**
* @description Constructor for Timer.
* @param interval Sets the interval for running the timer.
* @param callBack The callback function to be executed.
* @return {IntervalTimer} If exists, the existing object.
*/
constructor(interval = 10, callBack = () => {}) {
this.prevInterval = 0
if (this.instance == null) {
this.interval = interval
this.callBack = callBack
this.instance = this
} else {
return this.instance
}
}
/**
* @description Starts the timer.
*/
startTimer() {
this.timer = setInterval(this.callBack, this.interval)
}
/**
* @description Resets the timer.
* @return {number} Elapsed time in milliseconds.
*/
resetTimer() {
clearInterval(this.timer)
this.callBack = () => {}
return this.getElapsedTime()
}
/**
* @return {number} Elapsed time in milliseconds since reset.
*/
getElapsedTime(offset = 0) {
this.timeElapsed = this.timer - this.prevInterval
this.prevInterval = this.timer
return this.timeElapsed - offset
}
/**
* @return {number} Elapsed time since start.
*/
getRunTime() {
return this.timer
}
}
/**
* @author Nandan V
* Saturday, 01 August 2020 8:33 AM
* @description Example usage
*/
const ExampleIntervalTimer = function (output = (v) => console.log(v)) {
/**
* Create am object with default settings.
* @type {IntervalTimer} Used to get timing information.
*/
const timer = new IntervalTimer()
timer.startTimer()
// ... Initialization code ...
// I generally use it for timing tests in Jasmine JS.
/**
* Gets the runtime till this point.
* Can be subtracted from ElapsedTime to offset timing of initialization code.
*/
const initOffset = timer.getRunTime()
// ... A test ...
// The time taken to run the test.
output(timer.getElapsedTime(initOffset))
/**
* Returns the elapsed time and resets the timer to 0.
*/
output(timer.resetTimer())
}
export { IntervalTimer, ExampleIntervalTimer }
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