Is it possible to calculate a variable within a dataset using existing data as a reference point?

Question

Is it possible to calculate a variable within a dataset using existing data as a reference point?

Is there a way to dynamically compute some of the data variables in a Vue instance by referencing other variables and tracking their changes?

new Vue({
  el: '#root',
  data: {
    x: 1,
    y: x + 1
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>

<div id="root">
  {{ x }} and {{ y }}
</div>

This approach results in an error message:

Uncaught ReferenceError: x is not defined

.

How can I utilize previously defined variables to create new ones on-demand?

javascript vue.js

Answer 1

Answer №1

To find the solution, we can utilize computed values. In this case, b can be accessed in a similar manner as if it was defined in the data section:

new Vue({
  el: '#root',
  data: {
    a: 1
  },
  computed: {
    // defining a computed getter for b
    b: function() {
      // reference to the vm instance using 'this'
      return this.a + 1
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>

<div id="root">
  {{ a }} and {{ b }}
</div>

Answer 2

To find the solution, we can utilize computed values. In this case, b can be accessed in a similar manner as if it was defined in the data section:

new Vue({
  el: '#root',
  data: {
    a: 1
  },
  computed: {
    // defining a computed getter for b
    b: function() {
      // reference to the vm instance using 'this'
      return this.a + 1
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.0.3/vue.js"></script>

<div id="root">
  {{ a }} and {{ b }}
</div>

Answer 3

Answer №2

give this a shot

let y;
new React(y = {
   el: '#app',
   data: {
     num1: 2,
     num2: () =>  y.data.num1 + 2
   }
})

Answer 4

give this a shot

let y;
new React(y = {
   el: '#app',
   data: {
     num1: 2,
     num2: () =>  y.data.num1 + 2
   }
})

Is it possible to calculate a variable within a dataset using existing data as a reference point?

Answer №1

Answer №2

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