[Vuejs]-Accessing data from array in rendered list in vue.js

I don’t know exactly what you are trying to accomplish.

Don’t define the variables, if you are going to calculate them.

Use .filter to make a new array based on some condition, and use .length to get how many objects in that array

computed: {
    matchSkill() { return this.abilities.filter(ability => ability.booleanValue === "yes").length},
}

Example code