State Machine Docs: Syntax Error in Example

[xaviervalarino]

I've been reading over the docs for Choo and decided to work through the State Machine article—after watching davidkpiano's talk on the subject I wanted to get a better feel for how it works.

In the code example the constructor's method is named next, but then further down is called as transition().

export class StateMachine {
  constructor (initialState, transitions) {
    this.state = initialState
    this.transitions = transitions
  }

  next (transition) {
    var nextState = this.transitions[this.state][transition]
    if (!nextState) throw new Error(`invalid: ${this.state} -> ${transition}`)
    this.state = nextState
  }
}

machine.transition('timer')

After getting the names to match, I also had to remove export and turn the timer values into strings to get the example to work (with Node.js).

[goto-bus-stop]

Good finds! Would you like to open a PR that fixes those problems? The state machine documentation is in /content/docs/state-machines/index.md.

[xaviervalarino]

@goto-bus-stop Sure thing! I was considering it when I was submitting the issue, but wasn't sure what the export statement was doing. I am not familiar with ES6, but it looks like module.exports, so I imagine it is there to illustrate that the state machine should be used as a module?