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machine.js

  // Available variables:
  // - Machine
  // - interpret
  // - assign
  // - send
  // - sendParent
  // - spawn
  // - raise
  // - actions
  // - XState (all XState exports)
  
  const calculatorMachine = Machine({
    id: 'calculator',
    initial: 'results',
    states: {
      results: {
        on: {
          OPERAND: 'operand_a',
          MINUS: 'operand_a.negative'
        }
      },
      operand_a: {
        on: {
          OPERAND: {},
          OPERATOR: 'operator' 
        },
        initial: 'positive',
        states: {
          positive: {},
          negative: {}
        }
      },
      operator: {
        on: {
          OPERAND: 'operand_b',
          MINUS: 'operand_b.negative'
        }
      },
      operand_b: {
        on: {
          OPERAND: {},
          OPERATOR: 'operator',
          EQUALS: 'results' 
        },
        initial: 'positive',
        states: {
          positive: {},
          negative: {}
        }
      }
    }
  });