VueCalculator

var app = new Vue({
  el: '#app-1',
  data: {
    heading: 'Daretron vol. 2',
    selected: 'Operacija',
    options: [{
      label: 'Operacija'
    },
    {
      label: '+',
      op: (a, b) => a + b
    }, {
      label: '-',
      op: (a, b) => a - b
    }, {
      label: '*',
      op: (a, b) => a * b
    }, {
      label: '/',
      op: (a, b) => a / b
    }],
    firstOperand: "",
    secondOperand: "",
    result: "",
  },
  methods: {
    operation: function()  {
      var selectedOperation = this.options.find(item => item.label == this.selected)
      this.result = selectedOperation.op(parseFloat(this.firstOperand), parseFloat(this.secondOperand))
      this.firstOperand = ""
      this.secondOperand = ""
      this.selected = "Operacija"
    }
  }
})