/Javascript/React/Why is this undefined in react

Why is this undefined in react

There are a couple of ways to deal with it. see first stackoverflow answer you
will get it.

One is to add this.onToggleLoop = this.onToggleLoop.bind(this); in the constructor.

Another is arrow functions onToggleLoop = (event) => {...}.

And then there is onClick={this.onToggleLoop.bind(this)}.

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