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twhite96/updater-function.js

Created January 5, 2019 06:12
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Stopwatch Updater
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updater-function.js
//updater function
this.setState(state => {
if (state.running) {
clearInterval(this.timer);
} else {
const startTime = Date.now() - this.state.lapse;
this.timer = setInterval(() => {
this.setState({
lapse: Date.now() - startTime
});
});
}
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