what is good practice to run custom functions on a specific value of an array of objects in javascript?

You can use map method and some parameter destructuring.

const arrayOfObjects = [{"v1":"foo","v2":"bar","v3":"foobar"},{"v1":"foo2","v2":"bar2","v3":"foobar2"}]
const f1 = (v) => v.toUpperCase();
const f2 = (v) => v.toLowerCase();

const result = arrayOfObjects
  .map(({ v1, v2, ...rest }) => ({
    v1: f1(v1),
    v2: f2(v2)

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