how to call a function stored in an array

June 9, 2022

I have this simple example that works

const func1 = function (i) { return (i) }
const func2 = function (i) { return (i * 2) }
const func3 = function (i) { return (i * 3) }
const func4 = function (i) { return (i * 4) }
const funcs = ['func1', 'func2', 'func3', 'func4']

function myFunction() {

  let item = 3
  let i = 2
  let result = eval(`${funcs[item]}(${i})`)
  console.log(result)
  // what about call_user_func in google app script

}

Since eval() is not recommended, what will be the google app script equivalent of call_user_func (php)?

>Solution :

I’m unfamiliar with Google Apps Script but in standard JS you should just be able to call it like let result = funcs[item](i);

For this you also need to put your actual function variables into the array, like
const funcs = [func1, func2, func3, func4], not like const funcs = ['func1', 'func2', 'func3', 'func4']

Functions are first-class citizens in JS, which means you can pass them around and call them like any other variable